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Standards Handbook
AMCA Publication 99

The International Authority on Air System Components

AMCA 99 STANDARDS HANDBOOK

AIR MOVEMENT AND CONTROL ASSOCIAT

ION INTERNATIONAL 30 WEST UNIVERSITY DRIVE ARLINGTON HEIGHTS, IL 60004-1893 USA

AMCA 99 – Standards Handbook

COPYRIGHT 2003 by Air Movement and Control Association International, Inc. All rights reserved. Reproduction or translation of any part of this work beyond that permitted by Sections 107 and 108 of the 1976 United States Copyright Act without the permission of the copyright owner is unlawful. Requests for permission or further information should be addressed to the Executive Director, Air Movement and Control Association International, Inc.

AMCA 99 – Standards Handbook

AMCA 99 STANDARDS HANDBOOK CONTENTS

99-0021-01 99-0066-01 99-0068-03 99-0070-01 99-0098-00 99-0100-76 99-0200-00 99-0401-86 99-1401-66 99-2404-03 99-2405-03 99-2406-03 99-2407-03 99-2408-69 99-2410-03 99-2412-03 99-2413-03 99-2414-03 99-3001-03 99-3404-03

The Fan Laws The AMCA Vocabulary: Definitions The AMCA Vocabulary: Product Definitions The AMCA Vocabulary: Symbols Basic Series of Preferred Numbers Metric Units and Conversion Factors Charts & Tables Classification for Spark Resistant Construction Operating Limits for Central Station Units Drive Arrangements for Centrifugal Fans Inlet Box Positions for Centrifugal Fans Designation for Rotation and Discharge of Centrifugal Fans Motor Positions for Belt or Chain Drive Centrifugal Fans Operating Limits for Centrifugal Fans Drive Arrangements for Tubular Centrifugal Fans Impeller Diameters & Outlet Areas for Centrifugal Fans Impeller Diameters & Outlet Areas for Industrial Centrifugal Fans Impeller Diameters & Outlet Areas for Tubular Centrifugal Fans Dimensions for Axial Fans Drive Arrangements for Axial Fans

Purpose of AMCA Standards AMCA Standards are adopted in the public interest. They are intended to eliminate misunderstanding between the manufacturer and the purchaser and to assist in selecting, specifying, and obtaining the proper product for the particular need. Existence of an AMCA Standard does not in any respect preclude any member or non-member from manufacturing or selling products not conforming to the standard.

Approval of Standards Proposed standards are reviewed by the appropriate Standards Committees and by the Board of Directors before submittal to the membership for approval. An affirmation vote of two-thirds of the members affected is required for adoption or revision.

Review of Standards AMCA Standards are regularly reviewed, but may also be reviewed at any time at the request of the membership or by direction of the Board of Directors.

AMCA PUBLICATION 99 STANDARDS HANDBOOK CONTENTS

99-0021-01 99-0066-01 99-0068-03 99-0070-01 99-0098-00 99-0100-76 99-0200-00 99-0401-86 99-1401-66 99-2404-03 99-2405-03 99-2406-03 99-2407-03 99-2408-69 99-2410-03 99-2412-03 99-2413-03 99-2414-03 99-3001-03 99-3404-03

The Fan Laws The AMCA Vocabulary: Definitions The AMCA Vocabulary: Product Definitions The AMCA Vocabulary: Symbols Basic Series of Preferred Numbers Metric Units and Conversion Factors Charts & Tables Classification for Spark Resistant Construction Operating Limits for Central Station Units Drive Arrangements for Centrifugal Fans Inlet Box Positions for Centrifugal Fans Designation for Rotation and Discharge of Centrifugal Fans Motor Positions for Belt or Chain Drive Centrifugal Fans Operating Limits for Centrifugal Fans Drive Arrangements for Tubular Centrifugal Fans Impeller Diameters & Outlet Areas for Centrifugal Fans Impeller Diameters & Outlet Areas for Industrial Centrifugal Fans Impeller Diameters & Outlet Areas for Tubular Centrifugal Fans Dimensions for Axial Fans Drive Arrangements for Axial Fans

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 1 OF 10

THE FAN LAWS Fan impellers differ from one another in many respects, even among those of the same type. One characteristic that all share is that each individual impeller design can be uniquely related to the overall diameter of the impeller. Because of this unique relationship, all impellers that share the same geometric design but differ only in size are said to have similarity. Fan casings share in this unique relationship, with the casing being optimized with respect to an impeller design so that aerodynamic performance goals are achieved. A fan design, then, is a geometrically unique combination of fan impeller and fan casing. All sizes of fans produced according to this unique geometry have similarity based on their respective diameters. Similarity is useful in that it enables the prediction of aerodynamic performance: given the performance of a fan of a given diameter at a certain rotational speed and a certain air density, the performance of that same unique geometry at another impeller diameter, or rotational speed or air density can be determined. Note that the variables that affect a fan's aerodynamic performance are: impeller diameter, rotational speed and air density. Since these variables are expressed as ratios, they are dimensionless and are independent of the system of units used, as long as the units are used consistently for each ratio. The mathematical statements which describe the effects of these factors on aerodynamic performance for any known performance point are known collectively as the FAN LAWS. FAN LAWS FOR COMPRESSIBLE FLOW As with all laws, some similarity requirements must be met if the FAN LAWS are to be effective: A. DESIGN GEOMETRY Geometric similarity must exist between any two fan sizes; i.e., dimensions must be proportional and angularity must be constant for all essential air passages of the impeller and the casing. B. GAS DENSITY As air moves through the fan, it is acted upon by the rotating impeller and there results a pressure rise. With a pressure rise, one would expect that the gas undergoes compression. Compression, in turn, means a change in gas density. The compressibility coefficient (Kp) must be calculated for the condition. The supporting formulas for Kp originate in Appendix C, ANSI/AMCA Standard 210-99.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 2 OF 10

C. REYNOLDS NUMBER Reynolds number is one of many descriptors of fan performance, and further information is available in most textbooks on fluid mechanics. For our purposes here, it is necessary to know that for a given fan design geometry, there are many possible Reynolds numbers, and that there is a threshold value on either side of which fluids behave differently. The similarity requirement here is that both sets of operating parameters result in Reynolds numbers such that the effect of any difference between them is negligible. The implied requirement is that both of the Reynolds numbers must be on the same side of the threshold value. For additional information on Reynolds number, see Handbook of Fan Engineering, latest edition. D. MACH NUMBER Mach number relates to the velocity of a gas (air) as it passes into or through a fan. Similarity requires that the Mach numbers for the two sets of parameters must be reasonably close. Just as was the case with Reynolds number, there is a threshold value and a difference in performance on either side of the threshold. Since almost all fans operate well below the threshold value for Mach number, no procedure for determining the threshold value is given in this document. Then for any given point on a fan performance curve, the relationship between a known performance point and desired performance point c (converted) is given by the FAN LAWS.

THE FAN LAWS 1ST LAW:
3 ? Qc ? ? Dc ? ? Nc ? ? K p ? ? Q ? = ? D ? ? N ?? K ? ? ? ? ? ? ?? ? pc ? ?

2ND LAW:
2 2 ? Ptc ? ? Dc ? ? Nc ? ? K p ? ? ρc ? ?? ? ? ?=? ? ? ? ? ? Pt ? ? D ? ? N ? ? ? K pc ? ?? ρ ?

3RD LAW:

? Pvc ? ? P ?= ? ?

? Dc ? ? Nc ? ? ρc ? ?D? ?N? ?ρ? ? ? ? ? ? ?

2

2

?2001 Air Movement and Control Association International, Inc.

Errata – February 2005 AMCA 99-0021-01 On page 2 of 10 the last equation on the page should read:

? Pvc ? ? Dc ? ? Nc ? ? ρ c ? ?P ?=?D ? ?N ? ? ρ ? ? v ? ? ? ? ? ? ?
[The denominator of the first term should have the subscript “v”.]

2

2

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 3 OF 10

4TH LAW:

? Hc ? ?H ?= ? ?

? Dc ? ? Nc ? ?D? ?N? ? ? ? ?

5

3

? K p ? ? ρc ? ? ?? ? ? ? K pc ? ?? ρ ?

5TH LAW:

Psc = Ptc ? Pvc
Where Ptc and Pvc are established per the 2ND and 3RD FAN LAWS.

6TH LAW:

ηsc = ηtc ?

? Psc ? ? ? Ptc ?

Where Psc is established using the 5TH FAN LAW and Ptc is established using the 2ND FAN LAW. In the above, subscript c denotes the new operating condition, and: D = Impeller diameter Dc = Impeller diameter, converted N = Impeller rotational speed Nc = Impeller rotational speed, converted Q = Volume airflow rate Qc = Volume airflow rate, converted Pt = Pressure, total Ptc = Pressure, total, converted Pv = Pressure, velocity Pvc = Pressure, velocity, converted H = Power Hc = Power, converted Ps = Pressure, static Psc = Pressure, static, converted ηsc = Efficiency, static, converted ηtc = Efficiency, total, converted

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 4 OF 10

and Kp and Kpc are determined from:

? ? ln (1 + x ) ? ? z Kp = ? ? ?? x ? ? ? ln (1 + z ) ?
x= Pt Pt1 + (Cb p b )

? ?γ ?1 ?? Ch H z=? ? ? ? Q P + C p ( ) ( ) ? γ ?? ? t1 b b ? ? zc ? Pt1 + Cb p b ? ? ρc ? ? Nc ? ? Dc ? ? γ ? ? γ c ? 1 ? =? ? ? ?? ? ? ? ? ?? z ? Pt1c + Cb p bc ? ? ? ρ ?? N ? ? D ? ?γ ?1 ?? γ c ? ?? ? η γ ? ? ?? z ? ? η γ ?? η γ ? ? z 2 ?? ? = ??1 + ? t c ? 1? ? ? c ? + ? t c ? 1? ? c c ? 2 ? ? c ? ? , ? ? ? 6 ?? ?? ? γ c ? 1 ? ? ? 2 ? ? γ c ? 1 ? ? γ c ? 1 ?
?1 2 2

K pc

an approximation derived from a series expansion, sufficiently accurate for Kp >= 0.9, and fan mechanical efficiency ηt is given by:

ηt =

QPt K p Ch H

Note: For all fans, ηt=ηtc (for incompressible flow only) Where: Kp Kpc x z Pt1 Cb Ch pb γ EXAMPLE: The following example shows how the FAN LAWS, including compressibility, are applied in aerodynamic performance predictions for a given fan design.
?2001 Air Movement and Control Association International, Inc.

= Compressibility coefficient = Compressibility coefficient, converted = A coefficient of convenience in the equation = A coefficient of convenience in the equation = Total pressure at fan inlet = Barometer constant: SI = 1 (I-P = 13.63) = Power constant: SI = 1 (I-P = 6362) = Barometer pressure, Pa (in. Hg) = Ratio of specific heats = 1.4

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 5 OF 10

KNOWN PARAMETERS: SI impeller diameter fan rotational speed air density volume airflow rate total pressure barometric pressure power ratio of specific heats D N ρ Q Pt pb H 927 mm 1000 rpm 1.152 kg/m3 7.952 m3/s 953.7 Pa 97.359 kPa 9299 W 1.4 I-P 36.5 inches 1000 rpm 0.072 lbm/ft3 16850 cfm 3.84 in. wg 28.75 in. Hg 12.47 hp 1.4

γ

CONVERSION PARAMETERS: SI impeller diameter fan rotational speed air density volume airflow rate total pressure power barometric pressure Dc Nc ρc Qc Ptc Hc pb 1524 mm 820 rpm 1.2 kg/m3 UNKNOWN UNKNOWN UNKNOWN 101.321 kPa I-P 60 inches 820 rpm 0.075 lbm/ft3 UNKNOWN UNKNOWN UNKNOWN 29.92 in. Hg

To determine the flow rate Qc and pressure Ptc, FAN LAWS 1 and 2 must be used. The GIVEN and CONVERTED conditions provide all the information required for the calculations except Kp and Kpc.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 6 OF 10

Determine Kp:

? ? ln (1 + x ) ? ? z KP = ? ? ?? x ? ? ? ln (1 + z ) ?
EXAMPLE CALCULATIONS IN SI UNITS:

x=

Pt Pt1 + (Cb Pb )

=

953.7 0 + ((1)(97359))

=

953.7 97359

x = 0.0097957
? ?γ ?1 ?? Ch H z=? ? ? ? Q P + C P ( ) ( ) ? γ ?? ? t1 b b ? ? ? (1)(9299) ?1.4 ? 1 ? ? =? ? ? + 7.952 0 1 97359 ? 1.4 ? ?? ( )( ) ( ) ? ? ?

z = 0.0034317

? ? ln (1 + x ) ? ? z Kp = ? ? ?? x ? ? ? ln (1 + z ) ?
? ? ln (1 + 0.0097957 ) ? ? 0.0034317 =? ? ?? ? 0.0097957 ? ? ln (1 + 0.0034317 ) ?
K p = 0.99684

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 7 OF 10

ηt =

QPt K p Ch H

? (7.952 )(953.7 )(0.99684 ) ? =? ? (1)(9299) ? ?

ηt = 0.813, or 81.3%
To determine Kpc , calculate the factors in the necessary equations:
2 2 zc ? Pt1 = (Cb p b ) ? ? ρc ? ? Nc ? ? Dc ? =? ? ?? ? ? ? z ? Pt1c = (Cb p bc ) ? ? ? ρ ?? N ? ? D ?

? 0 + (1x97359 ) ? ? 1.2 ? ? 820 ? 2 ?1524 ? 2 =? ?? ? ?? ? ? ? 0 + (1x101321) ? ?1.152 ? ?1000 ? ? 927 ?

zc / z = 1.81905
Then:

zc ? z = (1.81905 )(0.0034317 ) = (0.006242 ) z
And:

? (ηt )(γ c ) ? ? (0.813 )(1.4 ) ? ? ?=? ? = 2.8455 ? γ c ? 1 ? ? 1.4 ? 1 ?

K pc =

1 ? 0.006242 2 ? ? 0.006242 ? 1 + (2.8455 ? 1)? ? ? + (2.8455 ? 1)(2.8455 ? 2 )? ? ? 2 6 ? ?

Then:

K pc = 0.994235
?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 8 OF 10

And to obtain the values for the unknowns at the converted conditions:

?1524 ? ? 820 ? ? 0.99684 ? Qc = 7.952 ? ? 927 ? ? ? ?1000 ? ?? ? 0.994235 ? ?

3

= 29.05 m 3 / s
?1524 ? Ptc = 953.7 ? ? ? 927 ?
= 1810.2Pa
2

? 820 ? ? ? ?1000 ?

2

? 1.2 ? ? 0.99684 ? ? ? ? 0.994235 ? ?? ?1.152 ?

?1524 ? ? 820 ? ? 1.2 ? ? 0.99684 ? H c = 9.299 ? ? ? ?1000 ? ? ? ?1.152 ? ?? ? 0.994235 ? ? ? 927 ?
= 64.31kW
EXAMPLE CALCULATIONS IN I-P UNITS:

5

3

x=

Pt Pt1 = (Cb p b )

=

3.84 0 + (13.63 )(28.75 )

=

3.84 391.86

x = 0.0097994
? ?γ ?1 ?? Ch H z=? ? ? ? Q P + C p ( ) ( ) ? γ ?? ? t1 b b ? ? ? (6362 )(12.47 ) ?1.4 ? 1 ? ? =? ? ? 16850 0 + 13.63 28.75 ? 1.4 ? ?? ( )( ) ( ) ? ? ?

? 79334.14 ? 0.4 ? ? =? ? ? ?1.4 ? ? ?16850 (0 + 391.86 ) ?
?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 9 OF 10

? (0.2857 )(79334.14 ) ? =? ? ? (16850 )(391.86 ) ? ? (0.2857 )(79334.14 ) ? =? ? (6602841) ? ?
= (0.2857 )(0.0120151)

[

]

z = 0.0034327
To determine Kpc, calculate the factors in the necessary equations: Then:
2 2 zc ? Pt1 + (Cb p b ) ? ? rc ? ? Nc ? ? Dc ? =? ? ?? ? ? ? z ? Pt1c + (Cb p bc ) ? ? ? r ?? N ? ? D ?

? 0 + (13.63 )(3.84 ) ? ? 0.075 ? ? 820 ? 2 ? 60 ? 2 =? ?? ? ?? ? ? ? 0 + (13.63 )(28.75 ) ? ? 0.072 ? ?1000 ? ? 36.5 ?

= 1.818652
zc = (1.818652 )(0.0034327 ) = 0.006243
And:

? ηt γ c ? ? (0.813 )(1.4 ) ? ?= ? ?=? ? γ c ? 1 ? ? 1.4 ? 1 ? K pc =

?1.1382 ? = 2.8455 ? ? 0.4 ? ? 1

? 0.006243 2 ? ? 0.006243 ? + ? ? 2.8455 1 2.8455 2 1 + (2.8455 ? 1)? ( )( ) ? ? ? 2 6 ? ? ? ?

Then:

K pc = 0.994262
?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE FAN LAWS

BSR AMCA STANDARD 99-0021-01 PAGE 10 OF 10

And to obtain the values for the unknowns at the converted condition:

? 60.0 ? ? 820 ? ? 0.075 ? ? 0.99684 ? Qc = 16850 ? ? 36.5 ? ? ? ?1000 ? ? ? ? 0.072 ? ?? ? 0.99426 ? ?

3

2

= 61534 cfm
? 60.0 ? ? 820 ? ? 0.075 ? ? 0.99684 ? Ptc = 3.84 ? ? 36.5 ? ? ? ?1000 ? ? ? ? 0.072 ? ?? ? 0.99426 ? ?
2 2

= 7.2867 in.wg

? 60.0 ? ? 820 ? ? 0.075 ? ? 0.99684 ? H c = 12.47 ? ? 36.5 ? ? ? ?1000 ? ? ? ? 0.072 ? ?? ? 0.99426 ? ?
= 86.189 hp

5

3

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 1 OF 17

ABSOLUTE PRESSURE – Pressure above a perfect vacuum; the sum of gauge pressure and atmospheric pressure. ABSOLUTE ROUGHNESS – A measure of surface unevenness; the distance between high and low points on a surface. ACFM (ACTUAL CUBIC FEET PER MINUTE) – Actual volume airflow rate through a plane of measurement, at the existing air density, expressed in ft3/min. ACMS (ACTUAL CUBIC METERS PER SECOND) - Actual volume airflow rate through a plane of measurement, at the existing air density, expressed in m3/s. ACTUATOR (OPERATOR) – A mechanism attached to a damper or adjustable louver to move its blades, or attached to a vaneaxial fan to change impeller blade pitch. An actuator may be manually, electrically, pneumatically or hydraulically powered. ACOUSTIC ATTENUATION DEVICE – Any component having sound absorption as its primary function. ADJUSTABLE PITCH – The ability to mechanically alter the angle (pitch) of an impeller blade with the impeller at rest. AIR CURTAIN (AIRSTREAM) – A directionally-controlled stream of air, moving across the entire height and width of an opening, which reduces the infiltration or transfer of air from one side of the opening to the other and/or inhibits the passage of insects, dust, or debris. AIR CURTAIN AVERAGE CORE VELOCITY – The average of several air curtain core velocities measured along the width of the air curtain. AIR CURTAIN CORE VELOCITY – The peak air velocity of the air curtain as measured across the air curtain depth at a specified distance from the discharge nozzle. AIR CURTAIN DEPTH – The airstream dimension perpendicular to both the height and width of the opening being protected. AIR CURTAIN UNIT EFFICIENCY – The ratio of the air curtain output air power to the power input to the motor, expressed as a percentage. AIR CURTAIN UNIT RATED THROW – The distance away from an air curtain unit discharge nozzle to a point where a specified minimum air velocity is achieved. AIR CURTAIN UNIT VELOCITY PROJECTION – The average air curtain core velocity at specified distances from the air curtain unit discharge nozzle. AIR CURTAIN WIDTH – The airstream dimension perpendicular to the direction of airflow and parallel to the width of the opening being protected. AIR (GAS) DENSITY – The mass per unit volume of air or gas.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 2 OF 17

AIRFLOW RATE – See VOLUME AIRFLOW RATE or MASS AIRFLOW RATE. AIRFOIL – (1) A shape such that, when it is moved through air, has greater lift than drag. (2) A blade or vane having a streamlined shape. AIR SYSTEM – An assembly of connected ducts, filters, conditioning devices, dampers, louvers and fans for the purpose of moving air from one place to another in a controlled fashion. AIR THROW – The horizontal or vertical axis distance an air stream travels after leaving an air outlet before the air velocity is reduced to a specific terminal value. AMCA TESTING LABORATORY – The association’s testing laboratory, currently located in Arlington Heights, Illinois, or an independent laboratory licensed by AMCA to perform pre-certification performance tests and performance check tests. AMCA ACCREDITED LABORATORY – A laboratory equipped and staffed to conduct tests according to the appropriate AMCA-accepted test method, and which has been inspected by an AMCA staff engineer and duly approved for such testing. ANECHOIC TERMINATION – A device placed at the end of a test duct to prevent excessive reflection of sound waves back into the duct, thus reducing interference with the sound waves being measured. ATTENUATE – To weaken a signal by reducing its amplitude. ATTENUATION – The amount by which sound amplitude is decreased as it travels from a sound source to a receiver located at a given point. AVERAGE OUTLET VELOCITY – (1) The airflow rate of a fan per unit area of the fan discharge, calculated by dividing the airflow rate by the area of the fan discharge. (2) The free-delivery airflow rate of an air curtain unit divided by the face area of the discharge nozzle. AXLE – A shaft on which a damper or louver blade rotates. BACKPLATE – A circular plate, a component of a centrifugal fan impeller, which is attached to the fan hub and serves as the major attachment for the impeller blades and as the means of transmitting torque to them. BACKPLATE / CENTERPLATE LINER – A narrow strip of steel, ceramic or synthetic material, installed in sets, each attached to the backplate / centerplate of an impeller, adjacent to an impeller blade, for the purpose of protection against erosion. BALANCING – The process of adding or removing mass on a rotor to move the center of gravity toward the axis of rotation so as to reduce the unbalanced forces. BAROMETRIC – Pertaining to a barometer or the results obtained by using a barometer.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 3 OF 17

BAROMETRIC PRESSURE – The absolute pressure exerted by the atmosphere at a location of measurement. BEARING LOSS – The power loss resulting from friction in the main bearings of a fan or motor. BLADE – (1) The flow element of an impeller, which, by its shape and motion, generates airflow inside a fan, transforming impeller rotational energy to kinetic energy of airflow. (2) A movable surface in a damper or louver that can be rotated to control airflow. (3) A stationary louver surface intended to restrict the passage of water, sound or other airborne materials, or to limit visual see-through. BLADE ENTRY SEAL – The sealing arrangement through which a damper blade passes in a guillotine damper. BLADE LINER – A steel, ceramic or synthetic material piece having the same size and shape as the fan blade, which covers the fan blade face in part or completely for the purpose of protection against erosion. BLADE PASSAGE FREQUENCY – The tone generated by the fan’s blades passing a fixed object and having a frequency given by: F(Hz) = (number of blades x fan revolutions per minute) / 60. BLADE SUPPORT – (1) A structural member, located inside the duct section of a guillotine damper frame, which supports the blade load when the damper is in the closed position; (2) A bracket that connects a stationary louver blade to a rear-mounted structural support. BLAST AREA – The outlet area of a centrifugal fan less the projected area of its cut-off. BONNET – The portion of a guillotine damper that supports the damper blade when the damper is in the open position. (1) OPEN TYPE: The damper blade is exposed to the atmosphere when blade is withdrawn from the duct. (2) FULLY ENCLOSED (SEALED) TYPE: The entire bonnet encloses the damper blade when the damper is in the open position. CASING – see HOUSING. CENTERLINE SUPPORT – A method of supporting a fan housing at its centerline when necessary to control differential thermal growth of the housing. CENTERPLATE – see BACKPLATE CERTIFIED RATING – A published performance rating of a product which AMCA has licensed to bear the AMCA Certified Performance Rating Seal. The seller of the product certifies that the rating is in accordance with the appropriate AMCA-approved test method and that the requirements of the AMCA Certified Ratings Program have been met. CERTIFIED RATINGS PROGRAM – The testing and licensing program established by AMCA International to verify the published performance ratings of a product produced by a seller.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 4 OF 17

CHAMBER – (1) A test enclosure having a means for settling airflow, a cross sectional area larger than the inlet/outlet of test equipment connected to it, and the capability for measuring airflow rate and pressure. (2) An enclosure used to regulate airflow and to absorb sound. CLASS STANDARD – An established minimum performance level of fan aerodynamic performance in terms of pressure and airflow rate. COMPRESSIBILITY – The characteristic of air or a gas whereby its density is a function of pressure. COMPRESSIBILITY COEFFICIENT – A thermodynamic coefficient used to correct the perfect gas equation when applied to air or gas. CONTINUOUS LINE (CONTINUOUS BLADE) – A term describing a louver constructed with blades that present an uninterrupted horizontal or vertical line to complement or enhance architectural features. CONTROLLABLE PITCH IMPELLER – An axial impeller having a mechanism by which the pitch angle of all the impeller blades can be changed while the impeller is rotating. CORE AREA – The front cross-sectional area (product of minimum width and minimum height) of the front opening of a louver assembly with the blades removed. CORE AREA VELOCITY – The airflow rate through a louver divided by its core area. CORROSION RESISTANT – A term descriptive of materials or surface treatments that reduce corrosive attack. COUNTERBALANCE – Weights or springs that offset the unbalanced weight of an eccentrically pivoted damper blade. COUNTERWEIGHT – An adjustable or variable weight used to offset (counterbalance) an eccentrically pivoted damper blade. CRITICAL SPEED, FIRST – The rotational speed of a fan corresponding to the lowest natural frequency of the rotating fan impeller and shaft assembly when mounted on rigid supports without benefit of damping. CUT-OFF – A baffle or plate at the narrowest radial distance between the impeller and the housing near the outlet of a centrifugal fan, and which directs air away from the impeller and minimizes recirculation of air. CURB – A roof penetration with a raised perimeter to seal against the weather and to facilitate installation of roof mounted ventilation equipment such as a fan or hood. DECIBEL – A dimensionless number expressing, in logarithmic terms, a level of sound pressure or power. DENSITY – The mass per unit volume of a gas, liquid, or solid.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 5 OF 17

DETERMINATION – The complete set of measurements for a particular point of operation for a product under test. The measurements must be sufficient to determine all performance variables. DIFFUSER – (1) A duct discharge termination through a ceiling for the control and discharge of air. (2) A gradual transition of a duct, located at a fan outlet, which increases in cross sectional area and permits a portion of velocity pressure to be regained as static pressure; also known as an evasé. DISCHARGE ANGLE – (1) The angle formed by the plane of an opening and the direction of an air curtain. (2) The angle of air or other gas flow exiting an impeller. DISCHARGE NOZZLE – An air curtain unit component that directs and controls the airstream. DISCHARGE NOZZLE DEPTH – The inside nozzle dimension perpendicular to both the direction of airflow and the width of the airstream. DISCHARGE NOZZLE WIDTH - The inside nozzle dimension perpendicular to the direction of airflow and parallel to the width of the airstream. DISCHARGE STATIC PRESSURE – See FAN STATIC PRESSURE DRY-BULB TEMPERATURE - Air temperature measured by a temperature-sensing device without modification to compensate for the effect of humidity. DRY-BULB THERMOMETER – An ordinary thermometer, especially one with an un-moistened bulb; not influenced by atmospheric humidity. DUCT – A passageway used primarily for conveying air or other gas at low pressure. DUCTED FAN – A fan having ductwork connected to the fan inlet, the fan outlet, or both. DYNAMIC SIMILARITY – A comparison that uses ratios of forces due to elasticity, viscosity, gravity, surface tension, inertia and pressure to show equivalence between two similar fans. The variables compared are fan Reynolds number, point of operation, compressibility, gas specific heat ratio, and tip speed Mach parameter. EFFICIENCY – A ratio of the useful energy provided by a dynamic application to the energy supplied to the system at a specific point of operation. END REFLECTION – A phenomenon that occurs whenever sound is transmitted across an abrupt change in area, such as from the end of a duct into a room. When end reflection occurs, some of the sound is reflected back into the smaller area of the duct and does not escape into the room. ENERGY FACTOR – The ratio of the total kinetic energy of airflow to the kinetic energy corresponding to the average air velocity. EQUIVALENT DIAMETER – The diameter of a circle having the same area as another geometric shape. For a rectangular cross-section having width (a) and height (b), the equivalent diameter is given by: De = (4ab/π)0.5

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 6 OF 17

EXPLOSION-PROOF APPARATUS – Apparatus enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor which may occur within it, and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and which operates at such an external temperature that a surrounding flammable atmosphere will not thereby be ignited. EXTERNAL STATIC PRESSURE – see FAN STATIC PRESSURE RISE EVAS? – see DIFFUSER EXPANSION JOINT (FLEXIBLE CONNECTOR) – A flexible member used to attach a fan inlet and/or outlet to a connecting duct. FACE AREA – The total cross-sectional area of an air curtain unit discharge, a damper, louver, or duct. FAN – (1) A device that uses a power-driven rotating impeller to move air or gas. The internal energy increase imparted by a fan to air or a gas is limited to 25 kJ/kg (10.75 BTU/lbm). (2) A device having a powerdriven rotating impeller, without a housing, for circulating air in a room. FAN AIR (GAS) DENSITY – The density of air or gas corresponding to the total pressure, total temperature, and composition of the air or gas at a fan inlet. FAN AIRFLOW RATE – The volume airflow rate at a fan inlet at fan air density. FAN APPURTENANCES – Accessories added to a fan for the purpose of control, isolation, safety, static pressure regain, erosion protection, etc. Common appurtenances include inlet box(es), inlet box damper, variable inlet vane, outlet damper, vibration isolation base, inlet screen, belt guard, evasé or diffuser, sound attenuator, erosion protection, and turning gear. FAN BOUNDARIES – Limits defining the interfaces between the fan and the remainder of the air system and delineated as the planes perpendicular to the airstream as it enters and leaves a fan. Various appurtenances, such as an inlet box, inlet vane, inlet cone, silencer, screen, rain hood, damper, evasé or diffuser, may be included as part of a fan between the inlet and outlet boundaries. FAN EFFICIENCY, STATIC – see FAN STATIC EFFICIENCY FAN EFFICIENCY, TOTAL – see FAN TOTAL EFFICIENCY FAN EQUIPMENT – An assembly of a fan and its various appurtenances, as defined by the fan boundaries. FAN IMPELLER POWER – The power delivered to a fan impeller, specifically, the fan shaft power minus the bearing loss. FAN INLET – The plane perpendicular to an airstream where the airflow first meets the inlet cone or the inlet box furnished by the fan manufacturer.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 7 OF 17

FAN INLET AREA – The gross inside area measured at the plane(s) of the inlet connection(s). For converging inlets, the inlet area is considered to be a plane perpendicular to the airstream where it first meets the inlet cone. FAN OUTLET – The plane perpendicular to the airstream at the outlet opening of the fan or the manufacturersupplied evasé or diffuser. FAN OUTLET AREA – The gross inside area measured at the plane of the outlet opening. For a roof ventilator, it is the gross impeller outlet area for centrifugal types or the gross housing area at the impeller for axial types. FAN PERFORMANCE CHARACTERISTICS – The pressure rise (total or static) and the volume airflow rate generated by a fan, and its power consumption at any given point of operation. FAN POWER INPUT – The power required to drive a fan and any elements in the drive train. FAN POWER OUTPUT – The useful power delivered to the air or a gas, and which is proportional to the product of the fan airflow rate, the fan total pressure, and the compressibility coefficient. FAN REYNOLDS NUMBER – A dimensionless parameter for judging dynamic similarity of flow in geometrically similar fans, relating inertia to viscous forces, and given by: Re = πND2ρ / 60? where: Re = fan Reynolds number, dimensionless π = 3.14159… N = fan rotational speed, rpm D = tip diameter of impeller, m (ft) ρ = inlet air density, kg/m3 (lbm/ft3) ? = absolute viscosity, Pa?s (lbm/ft?s)

FAN SHAFT – The spindle on which a fan impeller is mounted, and upon which it rotates. FAN SHAFT POWER – The power delivered to the input end of a fan shaft, exclusive of drive losses other than that due to the fan or motor bearings, and fan shaft seal friction. FAN SOUND POWER – The ratio of sound power, radiated into a standard test duct, to a reference value of 1.0x10-12 watts. FAN ROTATIONAL SPEED – The rotating speed of a fan impeller, in revolutions per minute. FAN STATIC EFFICIENCY – A parameter consisting of fan total efficiency multiplied by the ratio of static pressure to total pressure, at a given point of operation. FAN STATIC PRESSURE – At a given point of fan operation, the difference between fan total pressure and fan velocity pressure; the difference between static pressure at fan outlet and total pressure at fan inlet.

?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 8 OF 17

FAN STATIC PRESSURE RISE – At a given point of fan operation, the increase in static pressure between fan inlet and fan outlet. FAN TOTAL EFFICIENCY – At a given point of fan operation, a ratio equal to the fan power output divided by the power input to the fan. FAN TOTAL PRESSURE – At a given point of fan operation, the difference between total pressure at fan outlet and fan inlet. FAN VELOCITY PRESSURE – The pressure corresponding to the average air velocity at a specified fan outlet. FILTER – A device used to separate vibration on the basis of frequency. FIXED PITCH – A term descriptive of an axial impeller having all blades permanently secured at a given pitch angle. FLASHING – A sheet metal strip placed at the junction of intersecting building surfaces to resist the entrance of water. FLOW RATE – The volume flow rate of a gas at a specific gas density. FOUNDATION STIFFNESS – The lateral spring constant of the foundation as referenced to the fan bearing centerline. Factors to be considered include the foundation block, the sub-soil, piles, if any, the concrete pier supporting the steel fan supports, and the interface between the steel supports and the concrete pier. FREE AREA – The minimum louver or damper area through which air can pass. FREE AREA VELOCITY – The airflow rate through a damper or louver divided by its free area. FREE AIR – see FREE AIR DELIVERY FREE AIR DELIVERY – That point of operation where a fan or an air curtain unit operates against zero static pressure. FREQUENCY – The number of complete cycles in a unit of time. When applied to sound, it is the number of complete pressure wave fluctuations which pass a given point each second. For a time period of seconds, the unit of measure is the Hertz (Hz). GAS DENSITY – The mass per unit volume of air or gas. GAUGE PRESSURE – The value of a pressure when the reference pressure is the barometric pressure at the point of measurement. GEOMETRIC SIMILARITY – A comparison of the ratio of corresponding dimensions of two fans, including angles, each dimension proportioned to impeller diameter. The proportional dimensions include material thickness, clearances, and roughness, as well as airflow passages

?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 9 OF 17

GUIDE VANES – Curved stationary vanes (stator vanes) located at the impeller inlet or discharge to reduce swirl and to enhance static pressure regain from the airflow. HEAD – (1) The upper or highest frame member of a damper or louver. (2) Fluid pressure expressed in terms of height of water column. HOUSING – A stationary enclosure for an impeller, having an inlet and an outlet, and designed to direct the flow of air through the impeller and towards the outlet. The housing may also affect the energy transformation of the airstream. HOUSING SIDEPLATE LINER – A narrow strip of steel, ceramic or synthetic material fastened to the sideplate of a centrifugal fan housing at the intersection of the sideplate and the scroll, for the purpose of erosion protection. HUB – The center portion of an impeller, by which the impeller is connected to its shaft, and through which the shaft transmits torque to the impeller. HYDRAULIC DIAMETER – A characteristic dimension in Reynolds number calculations, taken normal to the fluid flow and equal to four times the cross-sectional area divided by the wetted perimeter. IDENTICAL MODULES – A standard for performance comparison wherein two fans have identical aerodynamic designs, including fan impeller diameter, impeller tip width, number of blades, blade pitch, blade arc, blade size, scroll configuration and angle of expansion, rotational speed, distance to the next adjacent fan or barrier, and essentially the same inlet and outlet conditions. Motor frame size and drive are be the same if these are within the airstream. IMPELLER – The assembled rotating component of a fan, designed to increase the energy level of the airstream. INDEPENDENT ACCREDITED LABORATORY – With respect to the AMCA International Accredited Laboratory Program, a laboratory not owned by or affiliated with an AMCA member company but which has been designated as an Accredited Laboratory by the AMCA Board of Directors for the purpose of performing pre-certification performance tests, performance check tests, and challenge tests. INLET BOX – A component, similar to a duct elbow, which can be added to the inlet of an axial or centrifugal fan for the purpose of directing airflow into the fan inlet in line with the axis of the fan shaft. INLET FLOW PROFILE – The shape of the air velocity profile just upstream of a fan inlet and which indicates variation in airflow through a plane extending across the airflow passage. INTERFERENCE FIT – A mating condition of two components wherein the limits of size are so specified that an interference always results when the mating components are assembled; either a press fit or a shrink fit. JACKSHAFT – (1) A separate shaft used to operate multiple louver or damper sections. (2) An intermediate shaft between motor and fan impeller.

?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 10 OF 17

JAMB – The vertical frame member on either side of a damper or louver. JOURNAL – The part of a rotor that is in contact with or supported by a bearing in which it revolves. KINEMATIC SIMILARITY – A relationship between airflow systems requiring that the ratios of all corresponding velocities be similar for two fans to be considered similar. This includes corresponding velocities of the air or gas and corresponding peripheral velocities of the impellers. The directions and points of application of all corresponding vectors must be identical. KINEMATIC VISCOSITY – The viscosity of a fluid divided by its mass density. LINKAGE – A system of bar links, pivots, and rotating members for the transfer of force and motion to louver and damper blades. MACH NUMBER – A ratio of fluid velocity to the speed of sound in the same fluid. MAKE-UP AIR – Outside air that is brought into a building to replace exhaust air and building leakage (exfiltration), or process exfiltration. MASS AIRFLOW RATE – The mass of air that passes through a given area in unit time and is obtained by multiplying the volumetric airflow rate by the air density. MAXIMUM CONTINUOUS RATING – The maximum continuous airflow, pressure and temperature values at which the fan is specified to operate. MEASUREMENT PLANE – The radial plane in the test duct, generally perpendicular to the airflow, at which measurement(s) is(are) obtained. MECHANICAL RUN-OUT – The total actual variation in the location of a shaft surface during a complete revolution as determined by a stationary measuring device such as a dial indicator. MOTOR POWER – The power delivered from the output shaft of the motor. MULLION – A frame support member between multiple section louvers or dampers. NATURAL FREQUENCY – The frequency at which a system oscillates in the absence of external forces and exhibits a maximum response to an external input. NON-DUCTED FAN – A fan without ductwork connected to either its inlet or its outlet. NOSE PIECE (REPLACEABLE) – A sacrificial metal, ceramic or synthetic material piece added to the leading edge of an airfoil blade for the purpose of erosion protection. NOZZLE – A flow-measuring device having a streamlined entrance and a sharp-edged outlet perpendicular to its longitudinal axis. Airflow rate through a nozzle is proportional to the square root of the differential pressure across the nozzle and the throat area of the nozzle. OCTAVE BAND – A range of frequencies between two end frequencies selected such that the center frequency is twice the center frequency of the next lowest band.
?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 11 OF 17

ONE-THIRD OCTAVE BAND – A band of frequencies resulting from the division of an octave band into three smaller bands. OPPOSED BLADE DAMPER – A damper constructed such that adjacent blades rotate in opposite directions. OUTLET VELOCITY – The average velocity of air emerging from an outlet, measured in the plane of the outlet. OUTLET VELOCITY UNIFORMITY – A measure of test velocity variation equal to the standard deviation of measured test velocities divided by the average of those test values, the ratio being subtracted from one (1.0). PACKING – Sealing material used to minimize or eliminate leakage at the shaft penetration of a housing or frame. PARALLEL BLADE DAMPER – A damper in which the blades rotate in the same direction. PARTIAL BLADE LINER – A narrow piece of metal, ceramic or synthetic material located at the intersection of the impeller blade and backplate or centerplate for erosion protection. PEAK DESIGN TEMPERATURE – The maximum temperature at which a piece of equipment can operate for a specific duration. POINT OF OPERATION – The relative position on a fan or air curtain unit performance curve corresponding to a particular airflow rate, pressure, power consumption, and efficiency. POINT OF RATING – The specified fan operating point on its characteristic curve. POWER RATING - The amount of power consumed by the drive motor(s) of the air curtain unit. PRESSURE – (1) Force per unit area; (2) Stress per unit volume of a fluid, corresponding to the energy per unit volume of a fluid. PRESSURE DIFFERENTIAL – Commonly, the change in static pressure across a device. The term is seldom if ever associated with velocity pressure or total pressure. PRESSURE DROP – Commonly, (1) The static pressure difference between two points in an airflow system, due to frictional resistance along system walls, or in passing over or through an obstruction; (2) A measure of the resistance to airflow across a device, which is expressed as the difference in static pressure across the device at a specific rate of airflow. The term is seldom if ever associated with velocity pressure or total pressure. PRESSURE LOSS – The change in total pressure due to friction and turbulence. PRODUCT LINE – A product or series of product sizes with a common design purpose and generally similar aerodynamic features, but not necessarily homologous, cataloged under the same product description or name and/or identifying references.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 12 OF 17

PROPELLER – A bladed device (impeller) that rotates on a shaft to produce a useful thrust of air or gas in a direction parallel with the shaft axis. PSYCHROMETRIC – Pertaining to the measurement and determination of water vapor content in atmospheric air. RACKING – The twisting of a frame out of its intended planar arrangement. RATE OF TEMPERATURE CHANGE – The increase or decrease in temperature per unit time. RELATIVE ROUGHNESS FACTOR – The measurement of surface unevenness, from peaks to valleys, divided by a dimension such as pipe diameter. RESONANCE – A condition of high vibration response that occurs when the frequency of an external driving force approaches the natural frequency of the system. RESONANT FREQUENCY – See NATURAL FREQUENCY RESONANT SPEED, DESIGN – The calculated fan rotational speed corresponding to the lowest natural frequency of the combined fan shaft in bending, considering the fan rotor, oil film, bearing housing, and bearing supports, but excluding the effect of foundation stiffness. RESONANT SPEED, INSTALLED – The calculated fan rotational speed corresponding to the lowest natural frequency of the combined fan shaft in bending, considering the fan rotor, oil film, bearing housing, and bearing supports, and including the effect of foundation stiffness. REYNOLDS NUMBER – A dimensionless number representing the ratio of internal forces to viscous forces at a particular point of a fluid in motion. Its value is calculated as: the fluid’s density times the flow velocity at the point of interest, multiplied by a characteristic length, and the product divided by the fluid’s viscosity. Re = ρ (VD / ?) = (VD / ν ) where: Re = Reynolds number, dimensionless ρ = inlet air density, kg/m3 (lbm/ft3) V = Velocity of air, m/s (ft/s) D = Diameter, m (ft) ? = absolute viscosity, Pa?s (lbm/ft?s) ν = kinematic viscosity, m2/s (ft2/s)

ROTOR – An assembly consisting of a fan impeller mounted on its shaft. SAMPLING TUBE – A windscreen tube designed for minimum sensitivity to airflow noise, and designed to be attached to a standard 13 mm (0.5 in.) microphone. SCROLL LINER – A metal, ceramic or synthetic material piece attached to a fan scroll for the purpose of erosion protection.

?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 13 OF 17

SEAL AIR – (1) Air introduced into the air chamber of an isolation damper at a pressure higher than that of gases either upstream or downstream, to prevent passage of duct gas across the enclosed damper space. (2) Pressurized air introduced into a shaft seal chamber to function as a leakage barrier to process gas. (3) Pressurized air introduced into a housing around a furnace to prevent the escape of products of combustion. SEATING TORQUE - The amount of torque required to compress the seals or hold the louver or damper blades in the closed position. SEISMIC QUALIFICATION – Documentation supplied with an item of equipment that substantiates the ability of the equipment to withstand the effects of an earthquake of specified magnitude. SHAFT – A cylindrical piece of metal, usually solid, that is used to support a rotating part such as a fan impeller, and transmit torque to the supported component. SHAFT SEAL – A device that creates a barrier over the circumference of a fan shaft or damper axle for the purpose of limiting or preventing the passage of air or gas across the barrier. SHALL and SHOULD – In this and other AMCA standards, the word shall is understood to be mandatory, and the word should as advisory. SHUT-OFF – That point of fan operation where the airflow rate is zero. SHUTTER – See BACKDRAFT DAMPER. SILL – The bottom or lowest frame member of a louver or damper. SIMILARITY – A ratio used to compare a given characteristic of two fans; when equated to unity, similarity is said to exist for that characteristic. The ratios considered may be for dynamic, geometric, and/or kinematic characteristics SKEWING – The deviation of a frame from rectangularity or from a straight line. SONE – (1) A unit of loudness corresponding to the loudness of a sound at a frequency of 1000 Hz and a sound pressure of 0.02 microbar (40 dB); (2) A linear unit of sound loudness based on the perception of the average human ear. SOUND – An auditory sensation produced by the vibration of matter that results in propagation by variation of pressure, particle displacement or density through an elastic medium. SOUND ATTENUATION - See ATTENUATION SOUND POWER LEVEL – The acoustic power rating of a sound source measured in decibels and equal to ten times the logarithm (base 10) of the acoustic power in watts with reference to 1x10-12 watts.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 14 OF 17

SOUND PRESSURE LEVEL – The acoustic pressure at a point in space where a microphone or a listener’s ear is situated. One decibel (dB) of sound pressure is defined as 20 times the logarithm (base 10) of the sound pressure fluctuation with reference to 0.0002 microbars (20 micropascals). SPECIFIC HEAT – The ratio of the amount of heat required to raise the temperature of a given mass of any substance one degree to that amount of heat required to raise the temperature of an equal mass of a standard substance one degree (usually water at 15°C (59°F)). SPECIFIC HEAT AT CONSTANT PRESSURE – The quantity of heat required to raise the temperature of a unit mass of a substance one degree at constant pressure. SPECIFIC HEAT AT CONSTANT VOLUME - The quantity of heat required to raise the temperature of a unit mass of a substance one degree at constant volume. SPECIFIC HEAT RATIO – The numeric ratio of the specific heat of a gas at constant pressure to that of the same gas at constant volume. STALL LIMIT – That point near the peak of an axial fan’s pressure curve (for a particular blade angle) that corresponds to the minimum airflow at which the fan can be operated without instability. STANDARD AIR – Air having a density of 1.2 kg/m3 (0.075 lbm/ft3), a specific heat ratio of 1.4, a viscosity of 1.819E-05 Pa?s (1.222E-05 lbm/ft-s) and an absolute pressure of 101.325 kPa (406.78 in. wg). Air at 20°C (68°F), 50% relative humidity, and 101.325 kPa (29.92 in. Hg) has these properties, approximately. STANDARD AIR DENSITY – A density of 1.2 kg/m3 (0.075 lbm/ft3), corresponding approximately to air at 20°C (68°F), 50% relative humidity, and 101.325 kPa (29.92 in. Hg). STANDARD ATMOSPHERIC PRESSURE – A reference pressure (assumed to be at sea level) defined by the International Civil Aeronautics Organization (ICAO) as 101.325 kPa. In I-P units the corresponding values are 14.696 psi or 29.921 in. Hg at 32°F. SCFM (STANDARD CUBIC FEET PER MINUTE) – The volume airflow rate through a plane of measurement, corrected to standard air density of 0.075 lbm/ft3. SCMS (STANDARD CUBIC METERS PER SECOND) - The volume airflow rate through a plane of measurement, corrected to standard air density of 1.2 kg/m3. START-OPEN PRESSURE – The differential pressure across a backdraft or pressure relief damper at which the blades begin to rotate towards the open position. STATIC PRESSURE – That portion of air pressure that exists by degree of compression only. STATIC REGAIN – (1) The conversion of velocity pressure at a small area into static pressure at a larger area by slowing the gas or air velocity by means of a diffuser or an evasé; (2) The amount of static pressure gained by conversion of velocity pressure to static pressure.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 15 OF 17

STATIC TEMPERATURE – The temperature that exists by virtue of the internal energy of the air alone. If a portion of the energy is converted to kinetic energy, the static temperature is decreased accordingly. STOP – An angle or rigid strip used to close the gap between a blade edge and frame at the top and bottom of a damper or a louver. SUB-FRAME (BUCKFRAME) – A frame installed in a wall opening to facilitate the mounting or removal of a louver. SUB-SILL (EXTENDED SILL) – A shaped metal flashing installed at the bottom of a wall opening to facilitate water drainage. SURGE LIMIT – A point near the peak of a centrifugal fan’s performance pressure curve that defines the minimum airflow rate at which a fan can be operated without instability. SYSTEM EFFECT FACTOR – A decrease in fan performance capability, observed as a pressure loss that results from the effect of fan inlet restrictions / obstructions, fan outlet restrictions or other conditions influencing the performance of the fan when it is installed in a system. SYSTEM PRESSURE LOSSES – The sum of the static pressure losses due to friction, shock, dissipation of velocity pressure at the system discharge and the static pressure differences between the entry and discharge openings of an air system. System pressure losses are total pressure losses. TEMPERATURE, DESIGN – The minimum or maximum temperature at which a fan or damper can be continuously operated. TEMPERATURE, DESIGN AIR – (1) That air temperature at which a heating, ventilating or air conditioning system or apparatus is designed to maintain (indoor design) or to operate against (outdoor design). Outdoor design temperature is usually give for both minimum and maximum conditions. (2) The maximum and/or minimum gas temperature for specification of process control equipment. TEMPERATURE, OPERATING – The air temperature in the fan under actual normal operating conditions. TERMINATING DUCT – Where a fan under test for sound and equipped with both inlet and outlet ducts, one duct contains the sound pressure measurement device. The duct on the opposite side may be equipped with an anechoic termination and is known as the terminating duct. TEST – A series of determinations for various points of operation of a fan, damper, louver, airflow measurement station or air curtain unit. TEST BLOCK – The operating test point above and beyond the Maximum Continuous Rating that demonstrates the fan margin to the customer.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 16 OF 17

TEST DUCT – (1) A duct section of prescribed length that is defined originally in ANSI/AMCA 210 (and subsequently in AMCA standards 500D and 500L), and which is used to control and measure airflow rate and pressure. (2) A duct that functions as the sound measurement section and has an anechoic termination. TIP SPEED – The peripheral velocity at the tips of a fan impeller. TIP SPEED MACH PARAMETER – A dimensionless number expressing the ratio of a fan impeller’s peripheral velocity to the local velocity of sound at the fan inlet. TOTAL PRESSURE – The air pressure that exists by virtue of the degree of compression and rate of motion of flowing air. It is equal to the algebraic sum of the velocity pressure and the static pressure at a point. Thus, if the air is at rest, the total pressure will equal the static pressure. TOTAL TEMPERATURE – The temperature that exists by virtue of the internal and kinetic energy of the air. If the air is at rest, the total temperature will equal the static temperature. TORSIONAL CRITICAL SPEED – The fan rotational speed that corresponds to the natural frequency in torsion of its power transmission system, including driver, drive train components, and the fan rotor. TURNING GEAR – An intermittent fan drive arrangement consisting of a motor, a speed reducer, and a unidirectional engagement clutch fastened to the outboard end of a fan shaft or motor shaft through a flexible coupling. The turning gear rotates the complete rotating assembly at a low speed to prevent distortion in the rotor assembly due to uneven cooling. The turning gear may be sized to have the capability of starting the main rotor. Axial fans generally do not require a turning gear. VANE – (1) A stationary curved surface used to straighten or direct airflow, (2) A flat or curved surface that can be rotated about an axis to direct airflow. VARIABLE PITCH IMPELLER – An axial impeller having a mechanism or mechanisms by which the pitch angle of each impeller blade can be changed while the impeller is at rest. VELOCITY DISTORTION PARAMETER – AXIAL – A parameter characterizing air velocity distortion within a measuring plane at a constant radius in a circular duct, and in a direction parallel to the fan shaft centerline in a rectangular duct. It is expressed as a percentage of the mean velocity of the air at the fan inlet VELOCITY DISTORTION PARAMETER – INLET FLOW – An indicator of the variation in the airflow field at the inlet plane of a fan. It is calculated by applying the principle of standard deviation, using velocity measurements taken in a matrix form in a transverse plane across the flow field and expressed as a percentage of the mean velocity of the air at the fan inlet. VELOCITY DISTORTION PARAMETER – TRANSVERSE – A parameter characterizing the air velocity distortion within a measuring plane in a radial direction for a circular duct and at a right angle to the fan shaft in a rectangular duct. It is expressed as a percentage of the mean velocity of the air at the fan inlet. VELOCITY PRESSURE – That portion of air pressure that exists by virtue of rate of motion only.

?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: DEFINITIONS

BSR AMCA STANDARD 99-0066-01 PAGE 17 OF 17

VELOCITY PROFILE – A graphic presentation of the distribution of velocities, shown parallel to the general direction of flow, in a moving fluid. VELOCITY PROJECTION – The average core velocity at several distances from a discharge nozzle of an air curtain unit. VIBRATION – The continuing periodic motion of an elastic system having properties of amplitude, frequency, and phase, with values generally reported as displacement, velocity, or acceleration. VISCOSITY – A proportionality factor relating the shearing stress to a unit rate of change in the velocity of the flowing gas or liquid. Also known as ABSOLUTE VISCOSITY or DYNAMIC VISCOSITY, depending on whether the value is defined in terms of force or terms of mass. VOLUME AIRFLOW RATE – The volume of air that passes through a given area in unit time. VOLUTE - See HOUSING. WAVELENGTH – In a wave, the distance between two adjacent points that have the same phase. For sound waves, wavelength is determined by dividing the speed of sound in the medium through which the wave propagates by the frequency of the sound. WET-BULB DEPRESSION – The difference between the dry-bulb and wet-bulb temperatures at the same location. WET-BULB TEMPERATURE – The temperature measured by a temperature sensor covered by a watermoistened wick and exposed to air in motion. When properly measured, wet-bulb temperature is a close approximation of the temperature of adiabatic saturation. WET-BULB THERMOMETER – A thermometer having a sensing bulb covered with cloth, usually muslin or cambric, and saturated with water. WHEEL – See IMPELLER. WIND-MILLING – The reverse-direction rotation of a fan rotor due to a flow of natural air into the fan housing when the fan driver is not energized.

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

ANSI/AMCA STANDARD 99-0068-03 PAGE 1 OF 7

ABRASION RESISTANT FAN (or DAMPER) - A fan or damper designed to minimize abrasion, having parts subject to wear constructed of materials that are abrasion resistant and/or are easily replaceable. ACOUSTICAL DUCT SILENCER – An air duct section containing sound absorbing materials that reduce the transmission of sound through the air passage. ACOUSTICAL LOUVER - A louver incorporating sound absorbing material to reduce sound transmission across an opening. ADJUSTABLE LOUVER - A louver in which the blades may be rotated either manually or mechanically. AIR CURTAIN UNIT – An air moving device that produces a curtain of air. AIR DIFFUSER - A duct discharge termination located in a ceiling and arranged to direct airflow, or to promote air mixing. AIRFLOW MEASUREMENT STATION - A multiple-point sensing device used to measure the airflow in a duct and which consists of a single or multiple array of sensors in permanent position across the duct system. 1. DIFFERENTIAL (VELOCITY) PRESSURE OUTPUT TYPE - Converts air velocity into a differential (velocity) pressure signal which correlates to the velocity or volume of air flowing through a duct. 2. ELECTRONIC OUTPUT TYPE - Converts air velocity into an electronic signal that correlates directly and proportionally to the velocity of the air volume flowing through a duct. AIR-HANDLING UNIT - A packaged assembly of air-conditioning components (coils, filters, fan, humidifier, and so forth) that provides for treatment of air before it is distributed. 1. BLOW-THROUGH – Fan is mounted upstream of a heat exchanger. 2. CENTRAL STATION – Does not include a source of heating or cooling. 3. COOLING – Includes a means for cooling air. 4. COOLING – HEATING – Includes the means for both heating and cooling air. 5. DRAW-THROUGH – Heat exchanger(s) are mounted upstream of the fan. 6. HEATING – Includes a means for heating air. AXIAL FAN - A fan in which the airflow is predominately parallel to the impeller’s axis of rotation. BACKDRAFT DAMPER - A damper which, when mounted in a duct or opening, permits airflow in one direction only. BALANCING DAMPER - A damper used to regulate the airflow in an air system. BAROMETRIC DAMPER - A backdraft damper having an adjustable start-open pressure and used for gravity ventilation or other low velocity applications.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

ANSI/AMCA STANDARD 99-0068-03 PAGE 2 OF 7

BATH FAN – A fan used to exhaust air from a bathing / toilet area for the primary purpose of moisture and/or odor removal. BIFURCATED FAN - A direct-driven fan having the airstream-mounted drive motor separated from the airstream by means of a compartment or tunnel. BLAST DAMPER – A damper that reacts to sudden pressure changes in an air system, to either relieve the air pressure, or to isolate a space from the rapid pressure rise. BLOWER – A fan that operates against air system resistance downstream of the fan; a Forced Draft Fan. BOX FAN – A fan used in an office or residential application and having the motor and impeller enclosed in an approximately square box having a handle. CAST-IRON VOLUME FAN – A fan having a housing made of cast iron. CENTRIFUGAL CEILING/WALL EXHAUSTER – A factory-assembled fan consisting of one or more centrifugal impellers connected to a motor and enclosed in a housing; usually including an inlet grille and a backdraft damper, and intended for installation in a ceiling or a wall. CEILING DAMPER - A device intended to protect an air duct opening in a fire-rated ceiling assembly and which operates to interrupt airflow automatically in the event of fire to restrict the passage of flame and heat. CEILING EXHAUST FAN - A fan mounted in a ceiling and which serves to exhaust air from a room. CEILING FAN - A propeller fan supported from a ceiling and which serves to circulate air within a given space; also known as an air circulation fan. CENTRIFUGAL FAN - A fan in which a gas, such as air, is moving in a primarily axial direction upon entering the impeller and has its direction changed by the impeller blades to an essentially radial flow at the impeller discharge. The impeller is generally contained in a volute housing CIRCULATING FAN - A fan used for moving air within a space, and which is unconnected to any ducting, and is usually without a housing. COMBINATION LOUVER-DAMPER - A louver having both stationary and eccentrically pivoted movable blades that can be opened and closed. COMBUSTION AIR BLOWER – A centrifugal fan that serves to supply pressurized air to a burner system combusting gas, oil, or other fuel. CONTRA-ROTATING FAN - An axial flow fan having two impellers arranged in series and rotating in opposite directions. CONVEYING FAN - A fan suitable for conveying solids (e.g., wood chips, textile waste, pulverized material, or dust).

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

ANSI/AMCA STANDARD 99-0068-03 PAGE 3 OF 7

CORROSION RESISTANT FAN – A fan having an impeller and housing constructed of materials that resist corrosion, or having airstream or exterior components surface-treated to minimize the corrosive effect of certain chemicals or compounds. CROSS-FLOW FAN - A fan in which the fluid path though the impeller is in a direction substantially at right angles to its axis with air both entering and leaving radially at its periphery. DAMPER – A device used to vary the volume of air passing through an opening, duct or confined cross-section by varying the cross-sectional area. DESTRATIFICATION FAN - An air circulation fan located in a room to move warm air from the ceiling downward or to mix air in a given space. DOWNDRAFT FAN – An exhaust fan that serves to remove heated air and moisture by inducing air to flow down to a fan inlet located below a cooking surface. DUST FAN - A fan that serves to extract dust-laden air. ELECTRIC AIR HEATER – A space heater having electric resistance elements as the heat source and a fan for the circulation of heated air. EVAPORATIVE COOLER – An assembly consisting of a fan or fans and other necessary equipment to cool by evaporation the airflow created by the fan(s). FACE-AND-BYPASS DAMPER – A pair of dampers that operate together but with opposite motion, to direct an airstream either through or around a heat transfer device. FIRE DAMPER - A device arranged to interrupt airflow automatically through part of an air system so as to restrict the passage of flame, and installed in a fire-related wall or floor to close automatically in the event of a fire in order to maintain the integrity of the fire-rated separation. FIXED LOUVER - A louver having immovable blades. FLUE GAS DESULFURIZATION FAN - An additional induced draft fan placed in series with and downstream of an induced draft fan to overcome losses of retrofit air pollution control devices. FORCED DRAFT FAN – A high pressure / high volume fan used to supply primary and secondary combustion air to a furnace / boiler and its exhaust system. See also: COMBUSTION AIR BLOWER and BLOWER. GAS RECIRCULATION FAN – An induced draft fan used to redirect boiler gases through the furnace, superheaters, economizers and to overcome losses in connecting ductwork GAS TIGHT FAN (DAMPER) – A fan or damper constructed with seals and gaskets at all housing penetrations to minimize gas leakage through the housing and appurtenances. GENERAL PURPOSE FAN - A fan suitable for handling clean air that does not exceed a temperature of 80°C (176°F), or 40°C (104°F) if the motor or the fan bearings are in the airstream.
?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

BSR AMCA STANDARD 99-0068-03 PAGE 4 OF 7

GOGGLE DAMPER – A damper having a single sliding blade that has a cut-out opening matching the inside dimension of the duct to which it is attached. The blade slides in tracks and may be positioned to either allow or restrict the passage of air or gas. GRAVITY ROOF VENTILATOR - A roof mounted hood or louvered penthouse that uses the difference in air density or internal building pressurization to vent air into or out of a building. GRILLE - A perforated or bladed covering for an air inlet or outlet. GUILLOTINE DAMPER - A damper used for isolation purposes and having a blade or blades that are withdrawn from the duct area when the damper is fully open. GUILLOTINE DAMPER, DOUBLE-BLADE - A guillotine damper having two parallel blades, the space between them capable of being pressurized to prevent duct gas leakage across the space between the blades when the damper is in the closed position. HAZARDOUS LOCATION FAN (DAMPER) - A fan or damper equipped with electrical equipment having enclosures tested as suitable to contain internal combustion without ignition of atmospheres external to the enclosures. The fan or damper itself is of spark resistant construction. HEAT RECOVERY VENTILATOR – A fan-powered assembly utilizing a heat exchanger or heat recovery material(s) to transfer energy from exhaust air to replacement air. HEAVY DUTY DAMPER – A channel frame air control device intended to be fastened between flanged duct sections and constructed to withstand the elevated temperatures, pressures and contaminated gas flows of industrial processes. HIGH PRESSURE FAN – A fan serving to supply air to an industrial process at relatively low airflow and relatively high pressure. HOT GAS FAN - A fan constructed of materials capable of operating continuously at elevated temperature INDUCED DRAFT FAN – A high pressure fan located downstream of a boiler/furnace which draws air or induces products of combustion from the boiler and discharges them through the exhaust system; any fan which induces airflow into the fan inlet. INDUSTRIAL FAN – A fan constructed of materials capable of withstanding the elevated temperatures, pressures and contaminated gas flows of industrial processes. INLET VANE (RADIAL) DAMPER – A round damper intended for installation at or in a fan inlet and which controls and/or pre-swirls air entering the fan impeller. The damper blades are mounted radially and operate in parallel. The cylindrical (external) type has a sleeve or channel frame that allows mounting directly to the exterior of a fan inlet. The cone (nested) type has blades supported by the centrifugal fan inlet cone. Either type may be constructed such that the blades are cantilevered from the outer attachment or are in addition supported by a center hub that may itself contain the operating mechanism.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

ANSI/AMCA STANDARD 99-0068-03 PAGE 5 OF 7

IN-LINE FAN – A fan designed to be mounted between duct sections with air inlet and outlet being in an axial direction. ISOLATION DAMPER - A low leakage damper intended to regulate or stop the airflow in branches of a duct system. ISOLATION DAMPER, MAN-SAFE – A damper containing an isolating system to seal off flue gases so that men without breathing apparatus or other special equipment may safely enter the isolated section. JET FAN - A fan mounted at the ceiling of a vehicular tunnel and which induces airflow by entrainment of air with that streaming from the fan outlet. KITCHEN FAN – A centrifugal or axial fan located in a kitchen area and which serves to exhaust heat and moisture. LOUVER - A device comprising multiple blades which, when mounted in an opening, permits airflow but inhibits the entrance of water or other elements. MAKE-UP AIR UNITS - A packaged assembly consisting of a heat source and fan(s) serving to supply fresh, tempered, replacement air for that exhausted from a building. MATERIAL HANDLING FAN - see CONVEYING FAN MECHANICAL DRAFT FAN – A generic term of classification applying to any of the fans used in a furnace or boiler system, including Forced Draft, Induced Draft, Primary Air, Overfire Air, Gas Recirculation, Seal Air, and Flue Gas Desulfurization fans. MIXED FLOW FAN - A fan in which the airflow through the impeller is intermediate between the centrifugal and axial flow types, the air moving both axially and radially. MULTI-STAGE FAN - A fan having two or more impellers that work in series, with guide (stator) vanes between the impellers. NON-CLOGGING FAN - A fan having an impeller designed to minimize clogging by virtue of its shape or by use of special materials. The fan may also incorporate other features to allow use of cleaning sprays and to facilitate the removal of any resulting materials. OVERFIRE AIR FAN – A fan that serves to deliver additional (excess) air downstream of the fuel burners in a boiler for the purpose of improving combustion. PACKAGED FAN – see UTILITY SET PARTITION FAN - A fan installed in or on a partition and used for moving air from one air space to another. PASSIVE THROUGH-THE-WALL INLET – A device mounted in an outside wall of a building and which serves to allow the entrance of ambient air to replace that which has been exhausted.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

ANSI/AMCA STANDARD 99-0068-03 PAGE 6 OF 7

PEDESTAL FAN – A propeller fan intended for mounting on a stand having a base and column. PENTHOUSE - A roofed structure incorporating louvers or louver blades in all or part of the walls and usually located on the roof of a building. PLENUM FAN - A fan having an un-housed centrifugal impeller that draws air into the impeller through an inlet located in a barrier wall, and having a driver located on the same side of the barrier as the impeller. PLUG FAN – A fan having an un-housed impeller arranged such that the system into which it is inserted may act as a housing, allowing air to be drawn into impeller inlet, and constructed such that the driver is located outside the duct system PORTABLE PERSONNEL COOLER – A type of air circulator fan having the impeller and motor enclosed in a common safety-guarded housing that is mounted on wheels or casters and which serves primarily to provide cooling for personnel. POSITIVE PRESSURE VENTILATOR – A portable fan that can be positioned relative to an opening of a confined space and cause it to be positively pressurized by discharge air velocity. It is principally used by firefighters to mitigate the effect of smoke and is also used to assist in inflating hot air balloons. POWER ATTIC VENTILATOR – A fan used to exhaust air from an attic. POWER GENERATION FAN – see MECHANICAL DRAFT FAN POWER ROOF/WALL VENTILATOR (PRV) - A fan consisting of a centrifugal or axial impeller with an integral driver in a weather-resistant housing and with a base designed to fit, usually by means of a curb, over a wall or roof opening. PRESSURE BLOWER (TURBO BLOWER) - see HIGH PRESSURE FAN. PRESSURE RELIEF DAMPER – A type of backdraft damper having an adjustable start-to-open pressure and which is capable of maintaining a relatively constant pressure at various airflows and which closes upon a decrease in differential pressure. PRIMARY AIR FAN – see COMBUSTION AIR FAN PROPELLER FAN - An axial fan having an impeller comprised of symmetrical and equally spaced blades extending radially from a central hub and which is mounted in an orifice plate or ring. RANGE HOOD – A hood located above a range, stove, grill, or oven and which serves to exhaust hot air, fumes or moisture directly to a building’s exterior or through filtering media for discharge back into the room. REGISTER - A grille equipped with an integral damper or control valve. REVERSIBLE AXIAL-FLOW FAN - An axial fan capable of changing impeller rotation so that air may be moved in either direction along the fan’s axis of rotation.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: PRODUCT DEFINITIONS
An American National Standard Approved by ANSI on August 6, 2003

ANSI/AMCA STANDARD 99-0068-03 PAGE 7 OF 7

SEAL AIR FAN – (1) A fan that serves to pressurize an enclosure around a furnace or boiler to prevent the escape of burned gases into ambient air. (2) A fan supplying air to a shaft seal chamber as a leakage barrier to process gas. (3) A fan supplying air to the chamber of an isolation damper to prevent the passage of duct gases across the enclosed space. SIGHT-PROOF LOUVER - A louver that cannot be seen through from any direction. SMOKE (LEAKAGE RATED) DAMPER - A damper intended to: (1) restrict the spread of smoke in HVAC systems that are designed to be automatically shut down in the event of a fire or (2) control the movement of smoke when the HVAC system is operational in a building having a smoke management system. SMOKE MANAGEMENT FAN (SMOKE VENTILATION FAN) – A fan that serves to exhaust smoke and heated air from a building and which may be certified to remain operable after exposure to a given temperature for a given duration. SPARK RESISTANT FAN (or DAMPER) - A fan or damper constructed to reduce the potential for spark generation when the airstream is potentially explosive. STATIC VENTILATING DEVICE – A device that passively exhausts air from a building by venting. TABLE FAN – An air circulator fan intended for use on a desk, table or counter top; it may also be provided with the means for being mounted to a wall. TEMPERATURE CONTROL DAMPERS – A pair of dampers intended to be operated together to provide a total airflow at a given temperature. Two different airflows are regulated by simultaneous damper adjustments. TUBE AXIAL FAN - An axial flow fan with the impeller in a cylindrical housing and without guide vanes to straighten the discharged air. TUBULAR CENTRIFUGAL FAN - A fan having a centrifugal impeller within a cylindrical housing discharging the air in an axial direction. UTILITY SET - A centrifugal fan designed as a packaged unit, ready to run, either belt-driven or directly connected to an electric motor. VANE AXIAL FAN - A fan comprised of an axial impeller in a cylindrical housing having guide vanes located upstream or downstream of the impeller, or both. VENTILATOR - A device that serves to supply air into or exhaust air from a building. VOLUME CONTROL DAMPER - A device which, when mounted in a duct or opening, is used to vary the volume of air flowing through the duct or opening and which can be operated manually or mechanically, and can have one or more blades. WET GAS FAN - A fan that serves to move air that contains particles of water. WHOLE-HOUSE FAN – A fan mounted in the ceiling or attic wall of a house and from which it serves to exhaust air and which incorporates a backdraft damper.
?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 1 OF 11

SYMBOL OR ABBREVIATION A A Ae Ao ah B B BPF BW b C C C C Cm Cn Cp Cv C1 C2 C3 C4

DESCRIPTION area of cross section duct width area-orifice equivalent to system area-nozzle with no loss absolute humidity, (mass)H20 / (mass)dry air minimum distance between the sill and bottom blade duct height blade pass frequency band width flow-induced absorption coefficient dynamic loss coefficient combined free field response correction nozzle discharge coefficient minimum distance between adjacent blades constant for tip speed Mach number nozzle discharge coefficient specific heat at constant pressure specific heat at constant volume free field microphone correction response frequency response correction of sampling tube (normal incidence) flow velocity correction for frequency response required by sampling tube modal correction for the frequency response required by sampling tube

SI m2 m m2 m2 kg/kg mm m Hz Hz dB --dB --mm ----J/kg-K J/kg-K dB dB dB dB

I-P ft2 ft ft2 ft2 lbm/lbm in. ft Hz Hz dB --dB --in. ----Btu/lbm-?F Btu/lbm-?F dB dB dB dB

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 2 OF 11

SYMBOL OR ABBREVIATION c D De De/y Dh DI DT DVM D1-6 d dBA E E Ei1-in Eo1-on Ev e eper ex F FLA f f

DESCRIPTION speed of sound diameter of duct or impeller equivalent diameter ratio of straightener cell size (dia. to thickness of cell) hydraulic diameter diameter of intermediate duct diameter of terminating duct digital voltmeter diameters along anechoic termination orifice diameter estimated sound pressure level at a location using "A" weighing network energy factor system resistance curve duct inlet end correction duct outlet end correction volts, direct current, output signal of thermal flow sensor orifice plate end reflection permissible specific unbalance per unit uncertainty in x beam load full load amps coefficient of friction frequency

SI m/s m m --m m m ----m ------dB dB Vdc dB ?m or (g·mm)kg --kg amps --Hz

I-P ft/s ft ft --ft ft ft ----ft ------dB dB Vdc dB in. or (lb in.)/lb --lbf amps --Hz

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 3 OF 11

SYMBOL OR ABBREVIATION fc G G g H H Ha HL Hm Hmo Ho Hr Hsr H/T I j K K KE KM Kp KT kW

DESCRIPTION cut-off frequency water volume flow rate balance quality grade acceleration due to gravity fan power input actual louver height air power of air curtain power transmission loss power input to motor motor power output fan power output fan impeller power fan shaft power axial fan hub-to-tip ratio index in transverse direction for velocity matrix index in axial direction for velocity matrix system effect factor loss coefficient relevant to a specific damper design sample friction chart correction factor for elevation friction chart correction factor for roughness compressibility coefficient friction chart correction factor for temperature kilowatts, electric power

SI Hz L/s --m/s2 kW mm kW kW kW kW kW kW kW ------------------kW

I-P Hz gpm --ft/s2 hp in. hp hp hp hp hp hp hp ------------------kW

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 4 OF 11

SYMBOL OR ABBREVIATION L L Le Lm ?Lmax Lp

DESCRIPTION length minimum distance between louver jambs equivalent length of straightener average sound level from multiplexing six duct stations or continuous circular traverses maximum difference of microphone readings (nose cone - sampling tube) sound pressure level re 20 ?Pa average sound pressure level at the measuring plane maximum sound pressure level within the measuring duct minimum sound pressure level within the measuring duct corrected sound pressure level of the fan sound pressure levels at each of six stations in the test duct recorded sound pressure level of room background as measured over the normal microphone path recorded sound pressure level of fan and room background as measured over the normal microphone path corrected sound pressure level with nose cone corrected sound pressure level of reference sound source

SI m mm m dB dB dB dB dB dB dB dB dB dB

I-P ft in. ft dB dB dB dB dB dB dB dB dB dB

Lp
Lpmax Lpmin Lp1,pn Lp1-p6 Lpb1,pbn Lpm1,pmn

LpNC Lpq1,pqn

dB dB dB

dB dB dB

Lpqm1,pqmn recorded sound pressure level of RSS and room background as measured over the normal microphone path LpST ?Lt Lw corrected sound pressure level with the sampling tube turbulence noise suppression value sound power level re 1x10-12 watts

dB dB dB

dB dB dB

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 5 OF 11

SYMBOL OR ABBREVIATION DESCRIPTION sound power level of fan (A-weighted; for LwA each band or summarized) LWA LWF LWG LWi LWiA LW1,Wn LWi1,Win LWK LWmi Lwmi1,wmin LWmo Lwmo1,wmon LWo LWoA LWr1,Wrn LWo1,Won Lx,x' L1-5 l la sound power level, A-weighted, re 1x10-12 watts capacity fraction, re 1.0E-12 watts generalized sound power level, re 1.0E-12 watts sound power level at the inlet, re 1.0E-12 watts sound power level at the inlet, A-weighted, re 1.0E-12 watts total sound power of the test fan sound power transmitted to the inlet duct of the fan specific sound power level, re 1.0E-12 watts measured sound power level from the inlet, re 1.0E-12 watts measured sound power at the open inlet of a fan measured sound power level from the outlet, re 1.0E-12 watts measured sound power at the open outlet of a fan sound power level at the outlet, re 1.0E-12 watts sound power level at the outlet, A-weighted, re 1.0E-12 watts sound power level rating of the reference sound source sound power transmitted to the outlet duct of the fan length of duct between planes x and x' lengths along anechoic termination length of moment arm output signal of thermal flow sensor

SI dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB m m mm mAdc

I-P dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB ft ft in. mAdc

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 6 OF 11

SYMBOL OR ABBREVIATION M M M Mt N NLA NPH NPV n P ?P ?Pc PL ?Pn ?Pn Ps ?Ps ?Ps ?Ps Psx Pt ?Pt Ptx

DESCRIPTION Mach number chamber dimension rotor mass tip speed Mach parameter rotational speed no-load amps nameplate power nameplate volts number of readings pressure pressure differential or pressure drop across device being tested pressure drop of combined dampers plane of measurement pressure differential across nozzle pressure drop of damper "n" static pressure or fan static pressure pressure loss across damper fan static pressure rise static pressure regain from diffuser/evasé static pressure at plane x total pressure or fan total pressure total pressure loss due to friction total pressure at plane x

SI --m kg --rev/min. A kW V --Pa Pa Pa --Pa Pa Pa Pa Pa Pa Pa Pa Pa Pa

I-P --ft ---(see W) --rev/min. A hp V --in. wg in. wg in. wg --in. wg in. wg in. wg in. wg in. wg in. wg in. wg in. wg in. wg in. wg

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 7 OF 11

SYMBOL OR ABBREVIATION Pv Pvx ?Px-x' p pb pe pp px Q Q Qd Qi Qr Qx R R R Re RSS r r r r

DESCRIPTION velocity pressure or fan velocity pressure fan velocity pressure or velocity at plane x pressure differential between planes x and x' atmospheric pressure corrected barometric pressure saturated vapor pressure at tw partial vapor pressure absolute pressure at plane x airflow rate or fan airflow rate directivity factor tested device airflow rate interpolated airflow rate test reference airflow rate airflow rate at plane x gas constant room constant reflection constant Reynolds Number; Fan Reynolds Number reference sound source radius ratio of duct area to orifice area index in the radial direction in the measuring plane radial distance from test duct centerline to sampling tube location

SI Pa Pa Pa kPa kPa kPa kPa kPa m3/s --m3/s m3/s m3/s m3/s J/kg-K m2 ------m ----m

I-P in. wg in. wg in. wg in. Hg in. Hg in. Hg in. Hg in. Hg cfm --ft3/min ft3/min ft3/min ft3/min ft-lb/lbm-?R ft2 ------ft ----ft

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 8 OF 11

SYMBOL OR ABBREVIATION rh S S S SEF SF SR sm T T T Ta t t td tt tw U Uper u V

DESCRIPTION relative humidity area or areas of test duct aspect parameter total loudness index system effect factor outlet or inlet area of fan system resistance factor maximum octave band loudness index number of grid velocity measurements in the transverse direction torque absolute inlet total temperature or absolute temperature length of transitions T1, T2, or T3 number of velocity measurements at a given radius r taken in circumferential increments temperature dry-bulb temperature total (stagnation) temperature wet-bulb temperature number of grid velocity measurements in the axial direction permissible residual unbalance number of velocity measurements at a given angle θ taken at radial increments velocity or average velocity mean velocity at plane 1

SI % m2 --sone --m2 m4 sone --N-m K m --?C ?C ?C ?C --g·mm --m/s m/s

I-P % ft2 --sone --ft2 ft4 sone --lbf-in. ?R ft --?F ?F ?F ?F --lb in. --ft/min. ft/min.

V

?2001 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 9 OF 11

SYMBOL OR ABBREVIATION Va

DESCRIPTION velocity profile distortion in axial direction (parallel to the fan impeller shaft) mean velocity for each of the T traverses mean velocity along each of the U grid stations mean velocity at a given radius r from duct center

SI % m/s m/s m/s %

I-P % ft/min. ft/min. ft/min. %

I

j

r

Vt
Vθ v W W W W w X ?X x x Y y Z z α β



velocity profile distortion in transverse direction (perpendicular to the fan impeller shaft) mean velocity at a given angle θ in the measuring plane velocity at any point power input to motor rainfall rate actual louver width rotor weight weight of water plotting variable absolute uncertainty in X function used to determine Kp peak air velocity along test plane nozzle expansion factor thickness of straightener element altitude function used to determine Kp static pressure ratio for nozzles diameter ratio for nozzles

m/s m/s kW mm/hr mm (see M) gram ------m/s --mm m -------

ft/min. ft/min. W in./hr in. lbm ozm ------ft/min. --in. ft -------

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THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 10 OF 11

SYMBOL OR ABBREVIATION γ ε η ηac ηs ηt θ λ ? v ρ ρs ρx σn ?

DESCRIPTION ratio of specific heats absolute surface roughness height motor efficiency air curtain unit efficiency fan static efficiency fan total efficiency index in the circumferential direction in the measuring plane wavelength absolute viscosity kinematic viscosity air density air density at standard conditions air density at plane x standard deviation of quantity n airflow direction average absorption coefficient for each surface average room absorption coefficient angular velocity (of a rotor)

SI --m % % % % --m Pa?s m2/s kg/m3 kg/m3 kg/m3 --------rad/s

I-P --ft % % % % --ft lbm/ft?s ft2/s lbm/ft3 lbm/ft3 lbm/ft3 --------rad/s

α
α

ω

SUBSCRIPT a b c d atmospheric conditions barometric pressure converted or calculated value dry-bulb temperature
?2001 Air Movement and Control Association International, Inc.

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THE AMCA VOCABULARY: SYMBOLS

BSR AMCA STANDARD 99-0070-01 PAGE 11 OF 11

g r w x x x,x' SYMBOL OR ABBREVIATION 0 1 2 3 4 5 6 7 8

static pressure reading wet-bulb depression generalized quantity (A,b,...,ρ) plane 0,1,2,.... as appropriate between planes x and x'

DESCRIPTION plane 0 (general test area) plane 1 (fan inlet) plane 2 (fan outlet) plane 3 (Pitot traverse station) plane 4 (duct piezometer station) plane 5 (nozzle inlet station in chamber) plane 6 (nozzle discharge station) plane 7 (outlet chamber measurement station) plane 8 (inlet chamber measurement station)

SI

I-P

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BASIC SERIES OF PREFERRED NUMBERS

BSR AMCA STANDARD 99-0098-00 PAGE 1 OF 2

Basic Series

SERIAL NUMBER

Theoretical values
Base 10 Mantissa of logarithms

R5

R 10

R 20

R 40

Calculated values 1.000 1.0593 1.1220 1.1885 1.2589 1.3335 1.4125 1.4962 1.5849 1.6788 1.7783 1.8836 1.9953 2.1135 2.2387 2.3714 2.5119 2.6607 2.8184 2.9854 3.1623 3.3497 3.5481 3.7584

Percentage differences between basic series and calculated values (%) 0 +0.07 -0.18 -0.71 -0.71 -1.01 -0.88 +0.25 +0.95 +1.26 +1.22 +0.87 +0.24 +0.31 +0.06 -0.48 -0.47 -0.40 -0.65 +0.49 -0.39 +0.01 +0.05 -0.22

1.00

1.00

1.00

1.00 1.06

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

000 .025 .050 .075 .100 .125 .150 .175 .200 .225 .250 .275 .300 .325 .350 .375 .400 .425 .450 .475 .500 .525 .550 .575

1.12

1.12 1.18

1.25

1.25

1.25 1.32

1.40

1.40 1.50

1.60

1.60

1.60

1.60 1.70

1.80

1.80 1.90

2.00

2.00

2.00 2.12

2.24

2.24 2.36

2.50

2.50

2.50

2.50 2.65

2.80

2.80 3.00

3.15

3.15

3.15 3.35

3.55

3.55 3.75

This reference standard is in harmony with ISO 497:1973. Those who wish to explore the topic of preferred numbers should refer to the ISO standard.
?2000 Air Movement and Control Association International, Inc.

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BASIC SERIES OF PREFERRED NUMBERS

BSR AMCA STANDARD 99-0098-00 PAGE 2 OF 2

Basic Series

SERIAL NUMBER

Theoretical values
Base 10 Mantissa of logarithms

R5

R 10

R 20

R 40

Calculated values 3.9811 4.2170 4.4668 4.7315 5.0119 5.3088 5.6234 5.9566 6.3096 6.6834 7.0795 7.4989 7.9433 8.4140 8.9125 9.4406 10.0000

Percentage differences between basic series and calculated values (%) +0.47 +0.78 +0.74 +0.39 -0.24 -0.17 -0.42 +0.73 -0.15 +0.25 +0.29 +0.01 +0.71 +1.02 +0.98 +0.63 0

4.00

4.00

4.00

4.00 4.25

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

.600 .625 .650 .675 .700 .725 .750 .775 .800 .825 .850 .875 .900 .925 .950 .975 1.000

4.50

4.50 4.75

5.00

5.00

5.00 5.30

5.60

5.60 6.00

6.30

6.30

6.30

6.30 6.70

7.10

7.10 7.50

8.00

8.00

8.00 8.50

9.00

9.00 9.50

10.00

10.00

10.00

10.00

This reference standard is in harmony with ISO 497:1973. Those who wish to explore the topic of preferred numbers should refer to the ISO standard.

?2000 Air Movement and Control Association International, Inc.

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METRIC UNITS AND CONVERSION FACTORS
Supersedes AMS-100-76

AMCA STANDARD 99-0100-76 PAGE 1 OF 1

Adopted 1976 Reviewed 1983

U.S. Customary Units VOLUME FLOW PRESSURE POWER TORQUE DENSITY SPEED (2) VELOCITY DIMENSIONS MOMENT OF INERTIA STRESS TEMPERATURE (3) cfm in. wg hp lbf-in lbm/ft3 rpm fpm in. lbm-ft2 lbf/in2 °F

AMCA Standard (1) Metric (SI) Unit cubic meter per second m3/s pascal Pa or N/m2 watt W or J/s newton meter N Cm kilogram per cubic meter kg/m3 revolution per second rps meter per second m/s millimeter mm kilogram meters squared kgCm2 pascal Pa or N/m2 kelvin

Conversion (4) Factor 0.00047195 248.36 745.70 0.11298 16.018 0.016667 0.0050800 25.400 0.042140 6894.8 (°F + 459.67)/1.8

Notes: 1) The choice of the appropriate multiple or sub multiple of an SI unit is governed by convenience. The multiple chosen for a particular application should be the one which will lead to numerical values within a practical range (i.e. kilopascal for pressure, kilowatts for power, megapascal for stress, and liters/second for volume flow.) 2) The second is the SI base unit of time. Although outside SI, the minute has been recognized by CIPM as necessary to retain for use because of its practical importance. 3) The kelvin is the SI base unit of thermodynamic temperature and is preferred for most scientific and technological purposes. The degree celcius (°C) is acceptable for practical applications. 4) Multiply “Customary” unit by this factor to obtain AMCA Standard except for kelvin temperature.
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CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 1 OF 8

STANDARD ATMOSPHERIC DATA VERSUS ALTITUDE CHART (SI)
Z Altitude m 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 t Temperature °C 15.00 14.35 13.70 13.05 12.40 11.76 11.11 10.46 9.81 9.16 8.51 7.86 7.21 6.56 5.90 5.25 4.60 3.95 3.30 2.65 2.00 1.35 0.70 0.53 -0.60 -1.25 -1.90 -2.55 -3.20 -3.85 -4.50 -5.15 -5.80 -6.46 -7.11 -7.76 p Atmospheric Pressure kPa 101.32 100.13 98.94 97.77 96.61 95.46 94.32 93.20 92.08 90.98 89.88 88.80 87.72 86.66 85.61 84.56 83.53 82.50 81.49 80.49 79.49 78.51 77.54 76.57 75.62 74.68 73.74 72.82 71.91 71.00 70.11 69.23 68.35 67.48 66.62 65.77 D Air Density kg/m3 1.230 1.215 1.201 1.189 1.177 1.166 1.155 1.145 1.134 1.123 1.112 1.102 1.091 1.080 1.069 1.058 1.047 1.037 1.026 1.016 1.006 0.996 0.986 0.976 0.967 0.957 0.948 0.938 0.929 0.919 0.909 0.900 0.890 0.880 0.871 0.862 : Dynamic Viscosity PaCs 1.793x10-05 1.790x10-05 1.786x10-05 1.784x10-05 1.780x10-05 1.777x10-05 1.774x10-05 1.771x10-05 1.768x10-05 1.765x10-05 1.761x10-05 1.758x10-05 1.755x10-05 1.751x10-05 1.748x10-05 1.745x10-05 1.741x10-05 1.738x10-05 1.735x10-05 1.732x10-05 1.728x10-05 1.725x10-05 1.722x10-05 1.718x10-05 1.715x10-05 1.712x10-05 1.708x10-05 1.705x10-05 1.702x10-05 1.699x10-05 1.695x10-05 1.692x10-05 1.689x10-05 1.685x10-05 1.682x10-05 1.679x10-05 v Kinematic Viscosity m2/s 1.456x10-05 1.473x10-05 1.487x10-05 1.500x10-05 1.512x10-05 1.524x10-05 1.536x10-05 1.546x10-05 1.559x10-05 1.571x10-05 1.584x10-05 1.595x10-05 1.609x10-05 1.621x10-05 1.635x10-05 1.649x10-05 1.663x10-05 1.676x10-05 1.691x10-05 1.705x10-05 1.718x10-05 1.732x10-05 1.746x10-05 1.760x10-05 1.774x10-05 1.789x10-05 1.802x10-05 1.818x10-05 1.832x10-05 1.845x10-05 1.865x10-05 1.880x10-05 1.898x10-05 1.914x10-05 1.931x10-05 1.948x10-05 c Speed of Sound m/s 340.43 340.05 339.66 339.28 338.89 338.51 338.19 337.73 337.34 336.95 336.57 336.18 335.79 335.40 335.01 334.62 334.22 333.83 333.44 333.05 332.66 332.26 331.87 331.48 331.08 330.69 330.29 329.90 329.50 329.10 328.71 328.31 327.51 327.11 326.70 326.70

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CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 2 OF 8

STANDARD ATMOSPHERIC DATA VERSUS ALTITUDE CHART (I-P)
Z Altitude ft -1000 -500 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 t Temperature °F 62.6 60.8 59.0 57.2 55.4 53.7 51.9 50.1 48.3 46.5 44.7 43.0 41.2 39.4 37.6 35.8 34.0 32.3 30.5 28.7 26.9 25.1 23.3 p Atmospheric Pressure in. Hg 31.02 30.47 29.92 29.38 28.86 28.33 27.82 27.32 26.82 26.33 25.84 25.37 24.90 24.43 23.98 23.53 23.09 22.65 22.22 21.80 21.39 20.98 20.58 D Air Density lbm/ft3 .0787 .0776 .0765 .0754 .0743 .0732 .0721 .0710 .0700 .0689 .0679 .0669 .0659 .0649 .0639 .0630 .0620 .0610 .0601 .0592 .0583 .0574 .0565 : Dynamic Viscosity lbm/ft-s 1.212x10-05 1.208x10-05 1.205x10-05 1.202x10-05 1.198x10-05 1.195x10-05 1.192x10-05 1.189x10-05 1.185x10-05 1.182x10-05 1.179x10-05 1.175x10-05 1.172x10-05 1.169x10-05 1.165x10-05 1.162x10-05 1.158x10-05 1.155x10-05 1.152x10-05 1.148x10-05 1.145x10-05 1.142x10-05 1.138x10-05 v Kinematic Viscosity ft2/s 1.538x10-04 1.556x10-04 1.576x10-04 1.595x10-04 1.614x10-04 1.633x10-04 1.653x10-04 1.673x10-04 1.694x10-04 1.714x10-04 1.735x10-04 1.757x10-04 1.778x10-04 1.800x10-04 1.823x10-04 1.846x10-04 1.869x10-04 1.892x10-04 1.916x10-04 1.904x10-04 1.965x10-04 1.990x10-04 2.015x10-04 c Speed of Sound ft/s 1120.7 1118.8 1116.9 1115.0 1113.1 1111.1 1109.2 1107.3 1105.3 1103.4 1101.4 1099.5 1097.5 1095.6 1093.6 1091.7 1089.7 1087.7 1085.7 1083.8 1081.8 1079.8 1077.8

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CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 3 OF 8

PSYCHROMETRIC DENSITY TABLE (SI)
Density of Saturated Air for Various Barometric Conditions – kg/m3 97 1.244981 1.242122 1.239396 1.236782 1.234260 1.231812 1.229423 1.227079 1.224768 1.222480 1.220207 1.217942 1.215680 1.213416 1.211147 1.208871 1.206587 1.204295 1.201994 1.199687 1.197375 1.195060 1.192743 1.190428 1.188116 1.185810 1.183512 1.181224 1.178948 1.176683 1.174432 1.172192 1.169963 1.167742 1.165527 1.163312 1.161092 1.158860 1.156606 1.154320 1.151991 98.5 1.263273 1.260977 1.258667 1.256345 1.254012 1.251672 1.249325 1.246973 1.244618 1.242261 1.239902 1.237545 1.235188 1.232834 1.230483 1.228135 1.225792 1.223453 1.221119 1.218791 1.216468 1.214150 1.211838 1.209530 1.207227 1.204927 1.202631 1.200338 1.198047 1.195757 1.193466 1.191174 1.188879 1.186581 1.184277 1.181965 1.179644 1.177313 1.174968 1.172609 1.170232 Barometric Pressure kPa 100 101.5 1.282390 1.302927 1.280094 1.300086 1.277753 1.297353 1.275377 1.294710 1.272975 1.292141 1.270553 1.289629 1.268119 1.287163 1.265679 1.284731 1.263236 1.282324 1.260796 1.279934 1.258360 1.277553 1.255931 1.275177 1.253510 1.272800 1.251098 1.270421 1.248697 1.268037 1.246304 1.265645 1.243921 1.263247 1.241546 1.260842 1.239179 1.258431 1.236817 1.256015 1.234459 1.253595 1.232105 1.251173 1.229752 1.248752 1.227399 1.246334 1.225045 1.243920 1.222689 1.241512 1.220330 1.239113 1.217968 1.236723 1.215603 1.234343 1.213236 1.231974 1.210866 1.229616 1.208497 1.227266 1.206131 1.224925 1.203771 1.222588 1.201420 1.220251 1.199084 1.217911 1.196770 1.215560 1.194483 1.213191 1.192231 1.210795 1.190025 1.208361 1.187875 1.205877 103 1.324194 1.322000 1.319731 1.317400 1.315018 1.312595 1.310140 1.307661 1.305166 1.302659 1.300147 1.297634 1.295123 1.292618 1.290121 1.287634 1.285157 1.282692 1.280239 1.277798 1.275367 1.272946 1.270533 1.268128 1.265728 1.263332 1.260938 1.258544 1.256148 1.253747 1.251342 1.248928 1.246506 1.244075 1.241632 1.239178 1.236712 1.234235 1.231747 1.229250 1.226746 104.5 1.340401 1.337965 1.335505 1.333027 1.330532 1.328024 1.325506 1.322979 1.320447 1.317912 1.315376 1.312841 1.310307 1.307778 1.305254 1.302735 1.300224 1.297720 1.295225 1.292738 1.290260 1.287790 1.285328 1.282875 1.280428 1.277988 1.275553 1.273122 1.270693 1.268266 1.265837 1.263406 1.260970 1.258527 1.256073 1.253607 1.251125 1.248624 1.246101 1.243553 1.240975

Dry-Bulb Temp. °C -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0

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CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 4 OF 8

PSYCHROMETRIC DENSITY TABLE (SI) (Continued)
Density of Saturated Air for Various Barometric Conditions – kg/m3 97 1.148567 1.146325 1.144073 1.141813 1.139548 1.137279 1.135008 1.132735 1.130461 1.128188 1.125917 1.123646 1.121378 1.119111 1.116846 1.114582 1.112318 1.110055 1.107790 1.105523 1.103253 1.100978 1.098695 1.096404 1.094102 1.091787 1.089456 1.087106 1.084735 1.082339 1.079915 1.077460 1.074970 1.072440 1.069867 1.067247 1.064575 1.061846 1.059056 1.056198 98.5 1.167391 1.164887 1.162437 1.160033 1.157668 1.155335 1.153029 1.150742 1.148470 1.146207 1.143949 1.141691 1.139431 1.137164 1.134888 1.132601 1.130299 1.127983 1.125650 1.123300 1.120932 1.118548 1.116147 1.113730 1.111299 1.108856 1.106402 1.103942 1.101478 1.099014 1.096553 1.094100 1.091661 1.089240 1.086844 1.084478 1.082149 1.079865 1.077632 1.075460 Barometric Pressure kPa 100 101.5 1.185062 1.203323 1.182780 1.200987 1.180492 1.198647 1.178197 1.196304 1.175897 1.193957 1.173591 1.191607 1.171279 1.189254 1.168962 1.186898 1.166639 1.184537 1.164311 1.182174 1.161977 1.179806 1.159639 1.177435 1.157295 1.175060 1.154946 1.172681 1.152592 1.170298 1.150234 1.167912 1.147871 1.165521 1.145503 1.163126 1.143131 1.160726 1.140754 1.158323 1.138373 1.155915 1.135988 1.153503 1.133599 1.151086 1.131206 1.148664 1.128809 1.146239 1.126408 1.143808 1.124004 1.141372 1.121596 1.138932 1.119184 1.136487 1.116769 1.134037 1.114351 1.131582 1.111930 1.129122 1.109506 1.126656 1.107079 1.124186 1.104649 1.121710 1.102216 1.119229 1.099780 1.116742 1.097342 1.114250 1.094902 1.111753 1.092459 1.109249 103 1.225071 1.222584 1.220116 1.217665 1.215229 1.212804 1.210388 1.207980 1.205577 1.203177 1.200778 1.198380 1.195979 1.193576 1.191169 1.188756 1.186338 1.183912 1.181480 1.179039 1.176591 1.174134 1.171669 1.169195 1.166714 1.164226 1.161731 1.159230 1.156724 1.154213 1.151700 1.149185 1.146669 1.144155 1.141644 1.139139 1.136640 1.134151 1.131673 1.129210 104.5 1.240138 1.237641 1.235154 1.232675 1.230205 1.227740 1.225283 1.222830 1.220383 1.217939 1.215499 1.213061 1.210625 1.208190 1.205755 1.203320 1.200883 1.198445 1.196003 1.193559 1.191110 1.188656 1.186196 1.183730 1.181257 1.178775 1.176286 1.173786 1.171277 1.168756 1.166224 1.163679 1.161121 1.158549 1.155963 1.153361 1.150743 1.148108 1.145455 1.142784

Dry-Bulb Temp. °C 18.5 19.0 19.5 20.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 31.5 32.0 32.5 33.0 33.5 34.0 34.5 35.0 35.5 36.0 36.5 37.0 37.5 38.0

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CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 5 OF 8

PSYCHROMETRIC DENSITY TABLE (I-P)

Dry-Bulb Temp. °F 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

Density of Saturated Air for Various Barometric Conditions – lbm/ft3 28.5 .07703 .07687 .07671 .07654 .07638 .07621 .07605 .07589 .07573 .07557 .07541 .07525 .07509 .07493 .07477 .07461 .07445 .07429 .07413 .07397 .07381 .07366 .07350 .07334 .07318 .07302 .07287 .07271 .07255 .07240 .07224 .07208 .07193 .07177 .07161 29.0 .07839 .07822 .07806 .07789 .07772 .07756 .07739 .07723 .07706 .07690 .07674 .07657 .07641 .07625 .07609 .07592 .07576 .07560 .07544 .07528 .07512 .07496 .07479 .07464 .07447 .07431 .07415 .07399 .07383 .07367 .07352 .07336 .07320 .07304 .07288 Barometric Pressure in. Hg 29.5 30.0 .07974 .08111 .07957 .08093 .07940 .08075 .07924 .08058 .07907 .08041 .07890 .08024 .07873 .07807 .07856 .07990 .07840 .07973 .07823 .07956 .07806 .07939 .07790 .07922 .07773 .09705 .07757 .07889 .07740 .07872 .07724 .07855 .07707 .07838 .07691 .07822 .07674 .07805 .07658 .07788 .07642 .07772 .07625 .07755 .07609 .07739 .07593 .07722 .07576 .07706 .07560 .07689 .07544 .07673 .07528 .07656 .07512 .07640 .07495 .07623 .07479 .07607 .07463 .07590 .07447 .07574 .07430 .07557 .07414 .07541 30.5 .08245 .08228 .08210 .08193 .08175 .08158 .08141 .08123 .08106 .08089 .08072 .08055 .08038 .08021 .08004 .07986 .07970 .07953 .07936 .07919 .07902 .07885 .07868 .07852 .07835 .07818 .07801 .07784 .07768 .07751 .07734 .07718 .07701 .07684 .07668 31.0 .08380 .08363 .08345 .08327 .08310 .08292 .08274 .08257 .08239 .08222 .08205 .08187 .08170 .08153 .08135 .08118 .08101 .08084 .08066 .08049 .08032 .08015 .07998 .07981 .07964 .07947 .07930 .07913 .07896 .07879 .07862 .07845 .07828 .07811 .07794

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CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 6 OF 8

PSYCHROMETRIC DENSITY TABLE (I-P)

Dry-Bulb Temp. °F 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

Density of Saturated Air for Various Barometric Conditions – lbm/ft3 28.5 .07145 .07130 .07114 .07098 .07083 .07067 .07051 .07035 .07020 .07004 .06988 .06972 .06956 .06940 .06925 .06909 .06893 .06877 .06861 .06845 .06829 .06812 .06796 .06780 .06764 .06748 .06731 .06715 .06698 .06682 .06665 .06648 .06632 .06615 .06598 .06581 29.0 .07272 .07256 .07240 .07224 .07208 .07192 .07176 .07160 .07144 .07128 .07112 .07096 .07080 .07064 .07048 .07032 .07015 .07000 .06983 .06967 .06950 .06934 .06917 .06901 .06885 .06868 .06852 .06835 .06818 .06801 .06785 .06768 .06751 .06734 .06717 .06700 Barometric Pressure in. Hg 29.5 30.0 .07398 .07525 .07382 .07508 .07366 .07492 .07350 .07475 .07333 .07459 .07317 .07442 .07301 .07426 .07285 .07410 .07268 .07393 .07252 .07377 .07236 .07360 .07220 .07343 .07203 .07327 .07187 .07310 .07171 .07294 .07155 .07277 .07138 .07261 .07122 .07244 .07105 .07227 .07089 .07211 .07072 .07194 .07056 .07177 .07039 .07160 .07022 .07143 .07005 .07126 .06989 .07109 .06972 .07092 .06955 .07075 .06938 .07058 .06921 .07041 .06904 .07024 .06887 .07006 .06870 .06989 .06853 .06972 .06835 .06954 .06818 .06937 30.5 .07651 .07634 .07618 .07601 .07584 .07568 .07551 .07534 .07517 .07501 .07484 .07467 .07451 .07434 .07417 .07400 .07383 .07366 .07349 .07333 .07316 .07299 .07281 .07264 .07247 .07230 .07213 .07195 .07178 .07161 .07143 .07126 .07108 .01091 .07073 .07055 31.0 .07770 .07760 .07744 .07727 .07710 .07693 .07676 .07659 .07642 .07625 .07603 .07591 .07574 .07557 .07540 .07523 .07506 .07489 .07472 .07454 .07437 .07420 .07403 .07385 .07368 .07351 .07333 .07316 .07298 .07280 .07263 .07245 .07227 .07209 .07191 .07174

?2000 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 7 OF 8

DRY AIR DENSITY CORRECTION FACTOR (SI)
(Multiply Standard Air Density, 1.2 kg/m x the Factor to obtain Density at Condition B.)
3

Altitude, m Barometer, mm Hg kPa Air Temp. °C -20 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 Altitude, m Barometer, mm Hg kPa Air Temp. °C -20 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340

Sea Level 759.97 101.32 1.22 1.12 1.03 .95 .93 .85 .79 .77 .73 .69 .65 .62 .57 .57 .56 .54 .52 .50 .49 1500 634.34 84.57 .97 .90 .84 .78 .74 .69 .65 .62 .60 .57 .53 .49 .48 .47 .45 .44 .43 .41 .40

300 733.47 97.79 1.12 1.04 .97 .91 .86 .80 .76 .72 .69 .65 .61 .57 .56 .55 .53 .52 .50 .48 .46 1800 611.3 81.50 .93 .87 .81 .75 .71 .67 .63 .61 .58 .55 .51 .47 .46 .46 .44 .43 .41 .40 .39

600 707.46 94.32 1.08 1.01 .94 .88 .83 .78 .73 .70 .67 .63 .59 .55 .54 .53 .51 .50 .48 .49 .48 2100 588.98 78.52 .91 .84 .78 .73 .69 .65 .61 .59 .56 .53 .50 .47 .45 .46 .43 .42 .40 .39 .37

900 682.43 90.98 1.04 .97 .90 .85 .80 .75 .70 .67 .64 .61 .57 .53 .52 .51 .49 .48 .46 .45 .43 2400 567.17 75.62 .87 .81 .75 .70 .67 .63 .59 .57 .54 .51 .49 .45 .43 .43 .41 .40 .38 .37 .36

1200 657.90 87.71 1.00 .94 .87 .81 .77 .72 .68 .65 .62 .59 .55 .51 .50 .49 .47 .46 .44 .43 .41 2700 546.30 72.83 .84 .80 .72 .68 .64 .60 .58 .58 .53 .49 .47 .43 .42 .41 .39 .38 .37 .35 .34

?2000 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

CHARTS & TABLES

BSR AMCA STANDARD 99-0200-00 PAGE 8 OF 8

DRY AIR DENSITY CORRECTION FACTOR (I-P)
(Multiply Standard Air Density, 0.075 lbm/ft x the Factor to obtain Density at Condition B.)
3

Altitude, ft. Barometer, in. Hg in. wg Air Temp. °F -40 0 40 70 100 150 200 250 300 350 400 450 500 550 600 700 800 900 1000 Altitude, ft. Barometer, in. Hg in. wg Air Temp. °F -40 0 40 70 100 150 200 250 300 350 400 450 500 550 600 700 800 900 1000

-1000 31.02 422.2 1.31 1.19 1.10 1.04 0.98 0.90 0.83 0.77 0.72 0.68 0.64 0.60 0.57 0.54 0.52 0.47 0.44 0.40 0.37 5000 24.90 338.9 1.05 0.95 0.88 0.83 0.78 0.72 0.66 0.62 0.58 0.54 0.51 0.48 0.45 0.44 0.41 0.38 0.35 0.32 0.30

Sea Level 29.92 407.5 1.26 1.15 1.06 1.00 0.95 0.87 0.80 0.75 0.70 0.65 0.62 0.58 0.55 0.53 0.50 0.46 0.42 0.39 0.36 6000 23.98 326.4 1.01 0.91 0.85 0.80 0.75 0.69 0.64 0.60 0.56 0.52 0.49 0.46 0.44 0.42 0.40 0.37 0.33 0.31 0.29

1000 28.86 392.81 1.22 1.11 1.02 0.96 0.92 0.84 0.77 0.72 0.67 0.62 0.60 0.56 0.53 0.51 0.48 0.44 0.40 0.37 0.35 7000 23.09 314.3 0.97 0.89 0.82 0.77 0.73 0.67 0.62 0.58 0.54 0.51 0.48 0.45 0.43 0.41 0.39 0.35 0.32 0.30 0.27

2000 27.82 378.6 1.17 1.07 0.99 0.93 0.88 0.81 0.74 0.70 0.65 0.60 0.57 0.54 0.51 0.49 0.46 0.43 0.39 0.36 0.33 8000 22.22 302.1 0.93 0.85 0.79 0.74 0.70 0.65 0.60 0.56 0.52 0.49 0.46 0.43 0.41 0.39 0.37 0.34 0.31 0.29 0.26

3000 26.82 365.0 1.13 1.03 0.95 0.89 0.85 0.78 0.71 0.67 0.62 0.58 0.55 0.52 0.49 0.47 0.45 0.41 0.37 0.35 0.32 9000 21.39 291.1 0.90 0.82 0.76 0.71 0.68 0.62 0.57 0.58 0.50 0.47 0.44 0.42 0.39 0.38 0.35 0.33 0.30 0.28 0.26

4000 25.84 351.7 1.09 0.99 0.92 0.86 0.81 0.75 0.69 0.64 0.60 0.56 0.53 0.50 0.47 0.45 0.43 0.39 0.36 0.33 0.31 10,000 20.58 280.1 0.87 0.79 0.73 0.69 0.65 0.60 0.55 0.51 0.48 0.45 0.42 0.40 0.38 0.36 0.34 0.32 0.29 0.27 0.25

?2000 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

CLASSIFICATIONS FOR SPARK RESISTANT CONSTRUCTION
Supersedes 99-0401-82

AMCA STANDARD 99-0401-86 PAGE 1 OF 1

Adopted 2-12-86 Reviewed 1986

Fan applications may involve the handling of potentially explosive or flammable particles, fumes, or vapors. Such applications require careful consideration of all system components to insure the safe handling of such gas streams. This AMCA Standard deals only with the fan unit installed in that system. The Standard contains guidelines which are to be used by both the manufacturer and user as a means of establishing general methods of construction. The exact method of construction and choice of alloys is the responsibility of the manufacturer; however, the customer must accept both the type and design with full recognition of the potential hazard and the degree of protection required. TYPE A CONSTRUCTION All parts of the fan in contact with the air or gas being handled shall be made of nonferrous material. Steps must also be taken to assure that the impeller, bearings, and shaft are adequately attached and/or restrained to prevent a lateral or axial shift in these components. The fan shall have a nonferrous impeller and nonferrous ring about the opening through which the shaft passes. Ferrous hubs, shafts, and hardware are allowed provided construction is such that a shift of impeller or shaft will not permit two ferrous parts of the fan to rub or strike. Steps must also be taken to assure that the impeller, bearings, damper blades and shaft are adequately attached and/or restrained to prevent a lateral or axial shift in these components. The fan shall be so constructed that a shift of the impeller or shaft will not permit two ferrous parts of the fan to rub or strike.

B

C NOTES:

1. No bearings, drive components or electrical devices shall be placed in the air or gas stream unless they are constructed or enclosed in such a manner that failure of that component cannot ignite the surrounding gas stream. 2. The user shall electrically ground all fan parts. 3. For this Standard, nonferrous material shall be any material with less than 5% iron or any other material with demonstrated ability to be spark resistant. 4. The use of aluminum or aluminum alloys in the presence of steel which has been allowed to rust requires special consideration. Research by the U.S. Bureau of Mines and others has shown that aluminum impellers rubbing on rusty steel may cause high intensity sparking. The use of the above Standard in no way implies a guarantee of safety for any level of spark resistance. “Spark resistant construction also does not protect against ignition of explosive gases caused by catastrophic failure or from any airstream material that may be present in a system.” This Standard applies to: Centrifugal Fans Axial and Propeller Fans Power Roof Ventilators This Standard applies to ferrous and nonferrous metals. The potential questions which may be associated with fans constructed of FRP, PVC, or any other plastic compound were not addressed.
?1986 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

OPERATING LIMITS FOR CENTRAL-STATION UNITS

AMCA STANDARD 99-1401-66 PAGE 1 OF 1

Adopted 11-30-66 Reviewed 1983

1. This standard includes the following total static pressure classifications: Class A Class B Class C Total static pressure of 0 inches to 3 inches maximum of water gauge. Total static pressure of 3 inches to 5.5 inches maximum of water gauge. Total static pressure over 5.5 inches of water.

2. Total static pressure includes the internal static pressure losses.

?1966 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DRIVE ARRANGEMENTS FOR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on April 17, 2003

ANSI/AMCA 99-2404-03 PAGE 1 OF 2

AMCA Drive Arrangement 1 SWSI

ISO 13349 Drive Arrangement 1 or 12 (Arr. 1 with sub-base)

Description For belt or direct drive. Impeller overhung on shaft, two bearings mounted on pedestal base. Alternative: Bearings mounted on independent pedestals, with or without inlet box.

Fan Configuration

Alternative Fan Configuration

2 SWSI

2

For belt or direct drive. Impeller overhung on shaft, bearings mounted in bracket supported by the fan casing. Alternative: With inlet box.

3 SWSI

3 or 11 (Arr. 3 with sub-base)

For belt or direct drive. Impeller mounted on shaft between bearings supported by the fan casing. Alternative: Bearings mounted on independent pedestals, with or without inlet box.

3 DWDI

6 or 18 (Arr. 6 with sub-base)

For belt or direct drive. Impeller mounted on shaft between bearings supported by the fan casing. Alternative: Bearings mounted on independent pedestals, with or without inlet boxes.

4 SWSI

4

For direct drive. Impeller overhung on motor shaft. No bearings on fan. Motor mounted on base. Alternative: With inlet box.

5 SWSI

5

For direct drive. Impeller overhung on motor shaft.No bearings on fan. Motor flange mounted to casing. Alternative: With inlet box.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DRIVE ARRANGEMENTS FOR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on April 17, 2003

ANSI/AMCA 99-2404-03 PAGE 2 OF 2

AMCA Drive Arrangement 7 SWSI 7

ISO 13349 Drive Arrangement

Description For coupling drive. Generally the same as Arr. 3, with base for the prime mover. Alternative: Bearings mounted on independent pedestals with or without inlet box. For coupling drive.
Generally the same as Arr. 3 with base for the prime mover. Alternative: Bearings mounted on independent pedestals with or without inlet box. For direct drive.
Generally the same as Arr. 1 with base for the prime mover. Alternative: Bearings mounted on independent pedestals with or without inlet box. For belt drive.
Impeller overhung on shaft, two bearings mounted on pedestal base. Motor mounted on the outside of the bearing base. Alternative: With inlet box. For belt drive. Generally the same as Arr. 9 with motor mounted inside of the bearing pedestal. Alternative: With inlet box.

Fan Configuration

Alternative Fan Configuration

7 DWDI

17 (Arr. 6 with base for motor)

8 SWSI

8

9 SWSI

9

10 SWSI

10

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

INLET BOX POSITIONS FOR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on May 9, 2003

ANSI/AMCA 99-2405-03 PAGE 1 OF 1

Notes: 1. Position of inlet box and air entry to inlet box is determined from the drive side as defined below: a. On single inlet fans: The drive side is that side which is opposite of the fan inlet. b. On double inlet fans: 1) With a single driver: That side with the driver is considered as the drive side. 2) With multiple drivers: That side with the higher total power is considered as the drive side. If the total power on each side is equal, then that side which has the fixed (non-expansion) bearing is considered as the drive side.

2. Position of inlet box is determined in accordance with diagrams. Angle of air entry to box is referred to the top vertical axis of fan in degrees as measured in the direction of fan rotation. Angle of air entry to box may be any intermediate angle as required. 3. Positions 135? to 225? in some cases may interfere with floor structure.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DESIGNATION FOR ROTATION AND DISCHARGE OF CENTRIFUGAL FANS
An American National Standard Approved by ANSI on April 17, 2003

ANSI/AMCA 99-2406-03 PAGE 1 OF 2

Clockwise Up Blast CW 360

Clockwise Top Angular Up CW 45

Clockwise Top Horizontal CW 90

Clockwise Top Angular Down CW 135

Clockwise Down Blast CW 180

Clockwise Bottom Angular Down CW 225

Clockwise Bottom Horizontal CW 270

Clockwise Bottom Angular Up XW 315

Counterclockwise Up Blast CCW 360

Counterclockwise Top Angular Up CCW 45

Counterclockwise Top Horizontal CCW 90

Counterclockwise Top Angular Down CCW 135

Counterclockwise Down Blast CCW 180

Counterclockwise Bottom Angular Down CCW 225

Counterclockwise Bottom Horizontal CCW 270

Counterclockwise Bottom Angular Up CCW 315

Notes: 1. Direction of rotation and angular reference is determined from the drive side as defined below: a. On single inlet fans: The drive side is that side opposite the fan inlet. b. On double inlet fans: 1) With a single driver: That side with the drive is considered the drive side. 2) With multiple drivers: That side with the higher total power is considered the drive side. If the total power on each side is equal, then the side that has the fixed (non-expansion) bearing is considered the drive side. 2. Direction of discharge is determined in accordance with diagrams. Angle of discharge is referred to the top vertical axis of fan and designated in degrees as measured in the direction of fan rotation. Angle of discharge may be any intermediate angle as required. 3. A fan inverted for ceiling suspension or rotated for side wall mounting will have its direction of rotation and angle of discharge determined when fan is located as if floor mounted. 4. This standard is in harmony with ISO 13349. In ISO 13349, CCW fans are referred to as LG, i.e., Left or Gauche, while CW fans are referred to as RD, i.e, Right or Droit-handed rotation.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DESIGNATION FOR ROTATION AND DISCHARGE OF CENTRIFUGAL FANS
An American National Standard Approved by ANSI on April 17, 2003

ANSI/AMCA 99-2406-03 PAGE 2 OF 2

METHODS OF DESIGNATION OF THE ANGULAR POSITION OF COMPONENT PARTS OF A CENTRIFUGAL FAN

360 0

360 0 315 0 45 0

45 0

315 0

900

270 0

270 0

900

1350

225 0

225 0

1350

180 0

180 0

CCW Example 1

CW Example 2

Outlet Inspection door Inlet box Motor

CCW 315° CCW 135° CCW 45° CCW 360°

Outlet Inspection door Inlet box Motor

CW 360° CW 45° CW 360° CW 135°

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

MOTOR POSITIONS FOR BELT OR CHAIN DRIVE CENTRIFUGAL FANS
An American National Standard Approved by ANSI on April 17, 2003

ANSI/AMCA 99-2407-03 PAGE 1 OF 1

Location of motor is determined by facing the drive side of the fan and designating the motor position by letters W, X, Y or Z as the case may be.

?2003 Air Movement and Control Association International, Inc.

20

19

18 17 16 15

To be designated as meeting the requirements of a specified Class, as defined in this Standard, a fan must be physically capable of operating safely at every point of rating on or below the "minimum performance" limit for that Class.

14

13?" @ 3780
STATIC PRESSURE (SP) inches of water
13 12 11 10
Typical Class II characteristic curve.

Ratings may be published in this UPPER RANGE.
mi nim um pe rfo rm an ce CL

Fan is required to be physically capable of performing over this range.

9

AS

8?" @ 3000
8 7
m in im um

CLASS III SELECTION ZONE

SI II

6?" @ 5260
an ce

pe rfo rm

6

5 4

5" @ 2300
m i in m

CLASS II SELECTION ZONE

CL AS S II

4?" @ 4175
Ratings may be published in this LOWER RANGE.

rm rfo I pe SS um LA C

3 2

ce an

CLASS I SELECTION ZONE

2?" @ 3200

1

1000

2000

3000

4000

5000

6000

7000

OUTLET VELOCITY (OV) feet per minute
?1983 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

OPERATING LIMITS FOR SINGLE WIDTH CENTRIFUGAL FANS – Ventilating Airfoils &
Backwardly Inclined.
Supersedes 2408-69

AMCA STANDARD 99-2408-69 PAGE 1 OF 5

Adopted 10-20-69

Reviewed 1983

19

18 17 16 15

To be designated as meeting the requirements of a specified Class, as defined in this Standard, a fan must be physically capable of operating safely at every point of rating on or below the "minimum performance" limit for that Class.

14

STATIC PRESSURE (SP) inches of water

13?" @ 3970
13 12 11 10
Ratings may be published in this UPPER RANGE.

mi nim um pe rfo rm an ce

Fan is required to be physically capable of performing over this range.

9

CL

8?" @ 3150
8 7
CLASS III SELECTION ZONE
pe rm rfo m in im um

AS SI II

6?" @ 5520
ce CL

6 5 4 3 2

an

5" @ 2415
m in

CLASS II SELECTION ZONE
rm rfo pe S I S um A im CL an ce

CLASS I SELECTION ZONE

2?" @ 3360

AS S II

4?" @ 4380
Ratings may be published in this LOWER RANGE.

1

1000

2000

3000

4000

5000

6000

7000

OUTLET VELOCITY (OV) feet per minute
?1983 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

OPERATING LIMITS FOR DOUBLE WIDTH CENTRIFUGAL FANS – Ventilating Airfoils &
Backwardly Inclined.
Supersedes 2408-69

AMCA STANDARD 99-2408-69 PAGE 2 OF 5

Adopted 10-20-69

Reviewed 1983

20

19

18 17 16 15

To be designated as meeting the requirements of a specified Class, as defined in this Standard, a fan must be physically capable of operating safely at every point of rating on or below the "minimum performance" limit for the Class.

14

STATIC PRESSURE (SP) inches of water

13 12 11 10
Ratings may be published in this UPPER RANGE. Fan is required to be physically capable if performing over this range.
rfo rm m in im

10?" @ 4600

9 8 7

6?" @ 3640
m in um im

CLASS III SELECTION ZONE

um pe an

ce CL AS S III

6 5 4 3 2

5?" @ 6100
an ce CL

pe rfo rm

4" @ 2800

m

in

im

CLASS II SELECTION ZONE

AS S II

CLASS I SELECTION ZONE

um CL pe AS rfo S rm I an

3?" @ 4900

ce

2" @ 3700

Ratings may be published in this LOWER RANGE.

1

1000

2000

3000

4000

5000

6000

7000

OUTLET VELOCITY (OV) feet per minute
?1983 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

OPERATING LIMITS FOR SINGLE WIDTH CENTRIFUGAL FANS – Ventilating Forward Curved.
Supersedes 2408-69

AMCA STANDARD 99-2408-69 PAGE 3 OF 5

Adopted 10-20-69

Reviewed 1983

20

19

18 17 16 15

To be designated as meeting the requirements of a specified Class, as defined in this Standard, a fan must be physically capable of operating safely at every point of rating on or below the "minimum performance" limit for that Class.

14

STATIC PRESSURE (SP) inches of water

13 12 11 10
Ratings may be published in this UPPER RANGE.

10?" @ 4800
m in im um

9 8 7

Fan is required to be physically capable of performing over this range.
rfo rm an ce CL

pe

6?" @ 3800

m

in

im

CLASS III SELECTION ZONE
um pe

AS S III

6

rfo

5?" @ 6400
rm an ce CL

5 4

4" @ 2900

m

in

im

CLASS II SELECTION ZONE

AS

S

II

3 2
CLASS I SELECTION ZONE

um CL pe AS rfo S rm an I

3?" @ 5150
Ratings may be published in this LOWER RANGE.

ce

2" @ 3900

1

1000

2000

3000

4000

5000

6000

7000

OUTLET VELOCITY (OV) feet per minute
?1983 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

OPERATING LIMITS FOR DOUBLE WIDTH CENTRIFUGAL FANS – Ventilating Forward Curved.
Supersedes 2408-69

AMCA STANDARD 99-2408-69 PAGE 4 OF 5

Adopted 10-20-69

Reviewed 1983

20

19

18 17 16 15

To be designated as meeting the requirements of a specified Class, as defined in this Standard, a fan must be physically capable of operating safely at every point of rating on or below the "minimum performance" limit for that Class.

14

13?" @ 2050
STATIC PRESSURE (SP) inches of water
13 12
Ratings may be published in this UPPER RANGE.
mi nim

11 10

Fan is required to be physically capable of performing over this range.

um pe rfo rm an

ce

9

CL

8?" @ 1630
8 7
m in im um

CLASS III SELECTION ZONE

6?" @ 2950
an ce

AS S III

pe rfo rm

6 5 4 3 2

CL

5" @ 1250

AS

m

in

im

CLASS II SELECTION ZONE

S II

CLASS I SELECTION ZONE

um CL pe AS rfo S rm I an

4?" @ 2350
Ratings may be published in this LOWER RANGE.

ce

2?" @ 1800

1

0

1000

2000

3000

OUTLET VELOCITY (OV) feet per minute
?1983 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

OPERATING LIMITS FOR CENTRIFUGAL FANS – Tubular.
Supersedes 2408-69

AMCA STANDARD 99-2408-69 PAGE 5 OF 5

Adopted 10-20-69

Reviewed 1983

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DRIVE ARRANGEMENTS FOR TUBULAR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on May 20, 2003

ANSI/AMCA 99-2410-03 PAGE 1 OF 1

Motor Left

ARRANGEMENT 1 For belt drive. Impeller overhung on a shaft supported by bearings mounted within casing. Motor mounted independent of casing. Horizontal discharge.

View Facing Outlet
ARRANGEMENT 4 For direct drive. Impeller overhung on motor shaft. Motor supported within casing. For horizontal or vertical discharge. Duct mounting shown.

View Facing Outlet
360 315 45

270

90

225

135 180

Motor Shown in Position 360

ARRANGEMENT 9 For belt drive. Impeller overhung on a shaft supported by bearings mounted within casing. Designed for mounting of motor on outside of casing in one of the standard locations shown. For horizontal and vertical discharge. Duct mounting shown.

View Facing Outlet
Arrow designates the direction of airflow.
Vertical Mounting

Rotation of fans is determined by viewing from the fan outlet end. Specify either up blast or down blast discharge for vertically-mounted fans. The locations of motors, supports, access doors, etc., are determined by viewing the outlet of the fan and resting location 180 on the floor as shown for Arrangement 9. Arrangements 4 and 9 can be furnished with supports for floor, wall or ceiling mounting. The position of these supports determines which motor locations are available for motor placement. Generally motor locations 135, 180, and 225 are not available on floor, wall or inverted ceiling-mounted fans and motor locations 45, 90, 270 and 315 may not be available for ceiling-hung fans. Another method of mounting vertical fans is shown in the view on the right. Specify fan to be furnished with ceiling-mounting brackets, floor mounting brackets, or both.
Ceiling-Mounting Brackets

Floor-Mounting Brackets

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

IMPELLER DIAMETERS & OUTLET AREAS FOR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on August 7, 2003

ANSI/AMCA 99-2412-03 PAGE 1 OF 2

D

B

A

Outlet Area Max (Inside dimensions) AxB SWSI DWDI 2 2 m m 0.081 0.145 0.083 0.149 0.098 .0176 0.105 0.121 0.133 0.146 0.169 0.179 0.208 0.215 0.261 0.266 0.323 0.331 0.392 0.420 0.484 0.533 0.585 0.675 0.716 0.833 0.871 0.189 0.218 0.240 0.263 0.304 0.322 0.375 0.387 0.470 0.479 0.581 0.595 0.705 0.756 0.871 0.960 1.054 1.215 1.289 1.500 1.568

Impeller Diameter D mm 311 *315 343 *355 381 *400 419 *450 464 *500 508 *560 565 622 *630 686 *710 762 *800 838 *900 927 *1000 1022 inches 12.25 13.50 15.00

Outlet Area Max (Inside dimensions) AxB SWSI DWDI 2 2 ft ft 0.86 1.05 1.29 1.55 1.89 2.33 Notes: 1. SWSI = Single width, single inlet fan. DWDI = Double width, double inlet fan. 2. Precise outlet area: SI SWSI: 2 2 OA(m ) = 0.833E-06 (Dmm) DWDI: 2 2 OA(m ) = 1.5E-06 (Dmm) I-P SWSI: 2 2 OA(ft ) = 5.74967E-03 (Din.) DWDI: 2 2 OA(ft ) = 1.034941E-03 (Din.) 3. A fan conforming to this Standard shall not exceed the impeller diameter or maximum outlet area shown. *Preferred sizes in SI and in accordance with ISO 13351.

16.50 18.25 20.00

1.57 1.91 2.30

2.82 3.45 4.14

22.25 24.50 27.00 30.00 33.00 36.50 40.25

2.85 3.45 4.19 5.17 6.26 7.66 9.31

5.12 6.21 7.54 9.31 11.27 13.79 16.77

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

IMPELLER DIAMETERS & OUTLET AREAS FOR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on August 7, 2003

ANSI/AMCA 99-2412-03 PAGE 2 OF 2

D

B

A

Outlet Area max (Inside dimensions) AxB SWSI m
2

Impeller Diameter D mm *1120 1130 1245 *1250 1378 *1400 1524 *1600 1676 *1800 1854 *2000 2051 *2240 2261 2496 *2500 2762 *2800 3048 *3150 3366 *3550 inches 44.50 49.00 54.25 60.00 66.00 73.00 80.75 89.00 98.25 108.75 120.00

Outlet Area Max (Inside dimension) AxB SWSI ft
2

DWDI m
2

DWDI ft
2

1.045 1.065 1.291 1.302 1.582 1.633 1.935 2.133 2.342 2.700 2.865 3.333 3.506 4.181 4.259 5.190 5.208 6.358 6.533 7.742 8.269 9.439 10.502

1.882 1.916 2.324 2.344 2.848 2.940 3.484 3.840 4.215 4.860 5.157 6.000 6.310 7.526 7.665 9.342 9.375 11.445 11.760 13.935 14.884 16.990 18.904

11.39 13.80 16.92 20.70 25.05 30.64 37.49 45.54 55.50 68.00 82.80

20.49 24.85 30.46 Notes: 1. SWSI = Single width, single inlet fan. DWDI = Double width, double inlet fan. 2. Precise outlet area: SI SWSI: 2 2 OA(m ) = 0.833E-06 (Dmm) DWDI: 2 2 OA(m ) = 1.5E-06 (Dmm) I-P SWSI: 2 2 OA(ft ) = 5.74967E-03 (Din.) DWDI: 2 2 OA(ft ) = 1.034941E-03 (Din.) 3. A fan conforming to this Standard shall not exceed the impeller diameter or maximum outlet area shown. *Preferred sizes in SI and in accordance with ISO 13351.

37.26 45.08 55.15 67.48 81.98 99.90 122.40

149.03

132.50

100.94

181.70

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

IMPELLER DIAMETERS & OUTLET AREAS FOR INDUSTRIAL CENTRIFUGAL FANS
An American National Standard Approved by ANSI on April 17, 2003

ANSI/AMCA 99-2413-03 PAGE 1 OF 1

Outlet Area Max (Inside Dimensions) AxB m
2

Impeller Diameter D* mm *280 *355 *450 *560

Inlet Diameter, Maximum at Point of Connection (Inside Diameter C) mm *160 *200 *250 11 inches

Impeller Diameter D inches

Outlet Area Max (Inside Dimensions) AxB ft
2

0.020 0.031 0.049 0.078

19.13 22.63 22.13 29.63 33.00 36.50 40.00 45.13 50.50 57.50 64.38 71.25 78.25 85.25 93.75 104.25

0.66 0.92 1.23 1.58 1.97 2.41 2.89 3.69 4.59 Notes: 1. Maximum impeller diameter: (SI) = 1.75 x maximum inlet inside diameter; rounded up to next highest standard SI impeller size. (I-P) = 1.75 x maximum inlet inside diameter. 2. A fan conforming to this standard shall not exceed the impeller diameter or maximum outlet area shown. *Preferred sizes in SI and in accordance with ISO 13351.

*315

13 15

1.26

*710

*400

17 19

0.196 0.246 0.312 0.396 0.503 0.636 0.785 0.985

*900 *1000 *1120 *1250 *1400 *1600 *1800 *2000

*500 *560 *630 *710 *800 *900 *1000 *1120 *1250 *1400 *1600

21 23 26 29 33 37 41 45 49 54 60

5.94 7.47 9.17 11.04 13.10 15.90 19.63

1.227 1.539 2.011

*2240 *2500 *2800

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

IMPELLER DIAMETERS & OUTLET AREAS FOR TUBULAR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on July 8, 2003

ANSI/AMCA 99-2414-03 PAGE 1 OF 2

Outlet Area Maximum 2 (πr ) m2 0.145 0.149 0.176 0.189 0.218 0.240 0.263 0.304 0.322 0.375 0.387 0.470 0.479 0.581 0.595 0.705 0.756 0.871 0.960 1.054 1.215 1.289 1.500 2.568 1.882 1.916 2.324 mm 311 *315 343 *355 381 *400 419 *450 464 *500 508 *560 565 622 *630 686 *710 762 *800 838 *900

Impeller Diameter D inches 12.25 13.50 15.00 16.50 18.25 20.00 22.25 24.50 27.00 30.00 33.00 36.50 40.25 44.50 49.00

Outlet Area Maximum (πr2) ft2 1.55 1.89 2.33 2.82 3.45 4.14 5.12 6.21 7.54 9.31 11.27 13.79 16.77 20.49 24.85

Notes: 1. Precise outlet area= SI: OA(m2) = 1.5x10-06 (D(mm))2 I-P: OA(ft2)=1.034941x10-02(D(in.))2 2. A fan conforming to this Standard shall not exceed the impeller diameter or maximum outlet area shown. 3. Outlet areas in SI and I-P units are not exactly equal due to rounding of sizes in the respective systems. *Preferred sizes in SI and conforming to ISO 13351.

927 *1000 1022 *1120 1130 1245

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

IMPELLER DIAMETERS & OUTLET AREAS FOR TUBULAR CENTRIFUGAL FANS
An American National Standard Approved by ANSI on July 8, 2003

ANSI/AMCA 99-2414-03 PAGE 2 OF 2

Outlet Area Maximum (πr2) m2
2.344 2.848 2.940

Impeller Diameter D mm
*1250 1378 *1400

Outlet Area Maximum (πr2) ft2
30.46

inches
54.25

3.484 3.840 4.215 4.860 5.157 6.000 6.310 7.526 7.665 9.342 9.375 11.445 11.760 13.935 14.884 16.990 18.904

1524 *1600 1676 *1800 1854 *2000 2051 *2240 2261 2496 *2500 2762 *2800 3048 *3150 3366 *3550

60.00 66.00 73.00 80.75 89.00 98.25 108.75 120.00 132.50

37.26 45.08 55.15 67.48 81.98 99.90 122.40 149.03 181.70

Notes: 1. Precise outlet area= SI: OA(m2) = 1.5x10-06 (D(mm))2 I-P: OA(ft2)=1.034941x10-02(D(in.))2 2. A fan conforming to this Standard shall not exceed the impeller diameter or maximum outlet area shown. 3. Outlet areas in SI and I-P units are not exactly equal due to rounding of sizes in the respective systems. *Preferred sizes in SI and conforming to ISO 13351.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DIMENSIONS FOR AXIAL FANS
An American National Standard Approved by ANSI on May 22, 2003

ANSI/AMCA 99-3001-03 PAGE 1 OF 1

MOTOR

I.D. FAN SIZE

CUTAWAY VIEW (Motor Support Not Shown)

Fan Size (Casing ID) mm 200 224 250 280 315 355 400 450 500 560 630 710 800 900 1000 1120 1250 1400 1600 1800 2000 2240 2500 2800 3150 3550

Outlet Area 2 m 0.031 0.039 0.049 0.062 0.078 0.099 0.126 0.159 0.196 0.246 0.312 0.396 0.503 0.636 0.785 0.985 1.23 1.54 2.01 2.54 3.14 3.94 4.91 6.16 7.79 9.90

Notes: 1. This standard is not limited to the range of sizes listed. Smaller and larger fan sizes conforming to the R20 series, with the 1000mm size as a base, may be included. See AMCA 99-0098, Basic Series of Preferred Numbers. 2. Fan size is based upon casing ID; impeller diameter is slightly smaller.

?2003 Air Movement and Control Association International, Inc.

Air Movement and Control Association International, Inc. Arlington Heights, IL 60004-1893 U.S.A.

DRIVE ARRANGEMENTS FOR AXIAL FANS
An American National Standard Approved by ANSI on June 10, 2003

ANSI/AMCA 99-3404-03 PAGE 1 OF 1

AMCA Drive Arrangement
1

ISO 13349 Drive Arrangement
1 12 (Arr. 1 with sub-base)

Description
For belt or direct drive. Impeller overhung on shaft, two bearings mounted either upstream or downstream of the impeller. Alternative: Single stage or two stage fans can be supplied with inlet box and/or discharge evasé. For belt or direct drive.

Fan Configuration

Alternative Fan Configuration

3

3 11 (Arr. 3 with sub-base)

Impeller mounted on shaft between bearings on internal supports. Alternative: Fan can be supplied with inlet box, and/or discharge evasé. For direct drive.

4

4 Impeller overhung on motor shaft. No bearings on fan. Motor mounted on base or integrally mounted. Alternative: With inlet box and/or with discharge evasé. For direct drive.
M M

M

M

7

7 Generally the same as Arr. 3 with base for the prime mover. Alternative: With inlet box and/or discharge evasé. For direct drive.
M
M

8

8 Generally the same as Arr. 1 with base for the prime mover. Alternative: Single stage or two stage fans can be supplied with inlet box and/or discharge evasé. For belt drive.
M
M

9

9 Generally same as Arr. 1 with motor mounted on fan casing, and/or an integral base. Alternative: With inlet box and/or discharge evasé. NOTE: All fan orientations may be horizontal or vertical. ?2003 Air Movement and Control Association International, Inc.

M


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