Centrifugal Fan Class IV - Greenheck Fan Corporation - Building ...

CENTRIFUGAL FAN FAN 

CLASS IV 

CATALOG CA ALOG SUPPLEMENT 

• Motor Information 

• Engineering Information 

• Air/Sound Performance 

• Dimensional Data 

GREENHECK 

® 

July 1998

2 

R 

Table of Contents 

Engineering Data 

Motor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 

Maximum and Minimum motor frame 

sizes, arr. 4 & 8 . . . . . . . . . . . . . . . . . . . . . . . . . 3 

V Belt Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 

Motor starting torque. . . . . . . . . . . . . . . . . . . . . . . 4 

Wheel moments of inertia . . . . . . . . . . . . . . . . . . . 4 

High temperature RPM derating factors . . . . . . . . 4 

High temperature operating limits . . . . . . . . . . . . . 4 

Effects of air density-High Inlet Suction . . . . . . . . 4 

Effects of air density-Temp. & Elevation . . . . . . . . 5 

Effect of installation on performance. . . . . . . . . . . 6 

Sound Performance Testing. . . . . . . . . . . . . . . 7 - 8 

Sample Fan Selection. . . . . . . . . . . . . . . . . . . 9 - 10 

Air and Sound Performance Data 

Tabulated air performance, fan curves and 

sound power ratings 

Belt Drive, BISW. . . . . . . . . . . . . . . . . . . . . . 11 - 25 

Direct Drive, BISWD . . . . . . . . . . . . . . . . . . . 26 - 33 

Dimensional Data 

Sizes 18-73, arr. 1 . . . . . . . . . . . . . . . . . . . . . . . . 34 

Sizes 30-49, arr. 4 . . . . . . . . . . . . . . . . . . . . . . . . 35 

Sizes 30-73, arr. 8 . . . . . . . . . . . . . . . . . . . . . . . . 35 

Greenheck certifies that the Model BISW fans shown 

herein are licensed to bear the AMCA Seal. The ratings 

shown are based on tests and procedures performed 

in accordance with AMCA Publication 211 and 

Publication 311 and comply with the requirements of 

the AMCA Certified Ratings Program. The certified 

ratings for Model BISW are shown on pages 11 to 25. 

GREENHECK 

®

Motor Selection 

Greenheck centrifugal fans can be supplied with any motor that is commercially available and is appropriate for the fan size and 

performance required. The tables show motor frame sizes corresponding to readily available 230/460 Volt 3-phase 60 Hz motors. Consult 

factory for motor frame sizes on motors with larger horsepowers, 50 Hz, or different voltages. See the maximum and minimum motor frame 

size chart on the bottom of the page if motor is for arrangement 4 or 8 fans. 

Notes: 

1. Belt drive fan motors are 1770 RPM unless the FRPM exceeds 2700, in which case 3600 RPM motors are selected. 

2. 870, 1170, 1770 motors are used on direct drive Arr. 4 and 8 fans. 

3. Open frame motors have a 1.15 service factor. TE motors have a 1.0 service factor. 

4. Energy Efficient motors meet EPACT Requirements Table 1210 

870 RPM MOTORS 

Single Speed 

Standard Exp Energy 

Efficient Resist. Efficient 

HP Open TE Open TE 

15 286T 286T CF 286T 286T 

20 324T 324T CF 324T 324T 

25 326T 326T CF 326T 326T 

30 364T 364T CF 364T 364T 

40 365T 365T CF 365T 365T 

50 404T 404T CF 404T 404T 

60 405T 405T CF 405T 405T 

75 444T 444T CF 444T 444T 

100 445T 445T CF 445T 445T 


Single Speed 

Energy Exp Premium 



15 254T 254T 254T 254T 254T 

20 256T 256T 256T 256T 256T 

25 284T 284T 284T 284T 284T 

30 286T 286T 286T 286T 286T 

40 324T 324T 324T 324T 324T 

50 326T 326T 326T 326T 326T 

60 364T 364T 364T 364T 364T 

75 365T 365T 365T 365T 365T 

100 404T 405T 405T 404T 405T 

125 405T 444T 444T 405T 444T 

150 444T 445T 445T 444T 445T 

Maximum and Minimum Motor Frame 

Sizes 

Arrangement 4 and 8 fans have specific motor size 

limitations. The chart below should be used to verify the 

motor selected will physically fit on the fan. 

Fan 

Size 

Mtr. 

RPM 

Arr. 4 Arr. 8 

Min. Max. Min. Max. 

30 1770 284T 326T 284T 326T 

33 1770 286T 365T 286T 365T 

36 1770 326T 405T 326T 405T 

40 1770 404T 445T 404T 445T 

44 1170 364T 445T 364T 445T 

49 1170 404T 445T 404T 445T 

54 1170 - - 444T 449T 

60 870 - - 445T 449T 

60 1170 - - 444T 449T 

66 870 - - 445T 449T 

73 870 - - 449T 449T 

Engineering Data 


Single Speed 




15 284T 284T 284T 284T 284T 

20 286T 286T 286T 286T 286T 

25 324T 324T 324T 324T 324T 

30 326T 326T 326T 326T 326T 

40 364T 364T 364T 364T 364T 

50 365T 365T 365T 365T 365T 

60 404T 404T 404T 404T 404T 

75 405T 405T 405T 405T 405T 

100 444T 444T 444T 444T 444T 

125 445T 445T 445T 445T 445T 


Single Speed 




15 215T 254T 254T 215T 254T 

20 254T 256T 256T 254T 256T 

25 256T 284TS 284TS 256T 284TS 

30 284TS 286TS 286TS 284TS 286TS 

40 286TS 324TS 324TS 386TS 324TS 

50 324TS 326TS 326TS 324TS 326TS 

60 326TS 364TS 364TS 326TS 364TS 

75 364TS 365TS 365TS 364TS 365TS 

CF - Consult Factory. Motors are Build-Ups 

V Belt Drives 

Constant Speed Drives 

Advantages of constant speed drives include low vibration 

levels, ease of assembly and low cost. Fan speed changes can 

be accomplished in most cases simply by changing the motor 

pulley. 

Constant speed drives are recommended over variable speed 

drives for applications that require motors 15 HP and larger and 

when FRPMs are in excess of 2700. 

Variable Speed Drives 

Not recommended for use on class IV fans. Variable speed drives 

allow the fan speed to be changed by adjusting the pitch 

diameter of the motor pulley. The power to the fan must be off 

and locked out and the belts must be removed before manually 

adjusting the variable pitch pulley. 

GREENHECK 

® 

3

High Temperature Operating Limits 

4 

Temperature Material Arrangement Includes Options 

-20 to 200°F Steel, Alum., SS 1,4 & 8 None 

201 to 500°F 

501 to 750°F 

Steel, Stainless Steel 

Aluminum limited 

to 250°F 

Steel, Stainless Steel 

Motor Starting Torque 

1 & 8 

1 & 8 

- Heat Slinger 

- High Temp. 

Paint 

- Heat Slinger 

- High Temp. 

grease 

- High Temp. 

Paint 

When selecting a motor for a centrifugal fan, the motor must be 

capable not only of driving the fan at operating speed, but also 

must be capable of accelerating the fan wheel, shaft and drive 

to the operating speed. 

The fan performance tables and curves in this catalog show the 

brake horsepower required to operate the fan once it is brought 

to speed. For applications requiring a large air volume at a low 

static pressure, the BHP required at the fan’s operating RPM 

may not be sufficient to initially start the fan. If the time required 

to bring the fan to speed is excessive, the motor winding 

insulation can be damaged due to excessive temperature rise 

and the life of the motor seriously affected. 

For a belt drive centrifugal fan the required motor starting 

torque capability can be expressed by the following formula: 

WR 2 

M = WR 2 

F x 

( MRPM) 

FRPM 2 

x (1.1) 

WR 2 

M = The moment of inertia that the 

motor must be capable of 

turning at the motor shaft, LB-Ft. 2 

WR 2 

F = The moment of inertia of the 

fan wheel, LB-Ft. 2 

FRPM = Fan RPM 

MRPM = Motor RPM 

For a direct drive fan, WR 2 

M must exceed WR 2 

F 

Effect of Air Density - High Suction at Fan Inlet 

Fan RPM Limitations 

The maximum allowable wheel RPM shown on the fan 

performance pages are for fans of standard steel operating at 

70°F. Since the strength of the fan wheel, shaft and bearings 

decrease with an increase in temperature, maximum allowable 

speeds must be reduced by the correction factors shown below. 

RPM Correction Factors For High Temperatures 

Temperature 

Wheel Material 

(Degrees F) Aluminum Steel 316 SS 

70 1.00 1.00 1.00 

200 1.00 .97 .92 

250 .95 .96 .89 

300 .95 .87 

400 .93 .83 

500 .90 .80 

600 .85 .77 

700 .80 .75 

800 .72 

Moments of Inertia (Lb-Ft 2 ) 

Moments of inertia are shown for steel 

wheels with 100% wheel width. Aluminum 

wheels are approximately 40% of the value 

shown. 

STEEL BACKWARD INCLINED 

CENTRIFUGAL WHEELS 

Fan Size 

Class IV 

Single Width 

18 17 

20 24 

22 40 

24 66 

27 94 

30 143 

33 210 

36 377 

40 581 

44 869 

49 1350 

54 2025 

60 3893 

66 5511 

73 7942 

The density used for fan selection is that which is measured at the fan inlet. When the inlet total pressure exceeds 10" in suction, the 

density at the fan inlet should be corrected by the following values. These values should be multiplied to the fan static pressure and 

the result used for the proper fan selection. With suction pressures less than 10 in., this correction is typically ignored. 

Inlet P t 

Suction 

D.C.F. 

-10" 1.03 

-14" 1.04 

-18" 1.05 

-22" 1.06 

EXAMPLE 

10 in. Ps x 1.03 = 10.3 in. Corrected Ps. 

Use 10.3 in. Ps to select fan in performance pages. 

GREENHECK 

®

Effect of Air Density - Temperature and Elevation 

Ratings in the fan performance tables and curves of this catalog are based on standard air (clean, dry air with a density of .075 pounds 

per cubic foot, barometric pressure at sea level of 29.92 inches of mercury, temperature of 70°F.). Selecting a fan to operate at 

conditions other than standard air requires an adjustment to both static pressure and brake horsepower. 

A cubic foot of air has a constant volume regardless of temperature or elevation. However, air density changes with non-standard 

temperature or elevation. Therefore, when selecting a fan to operate at a non-standard air density using standard air density tables and 

curves, corrections must be made to parameters affected by air density. These parameters are static pressure and brake horsepower. 

For example, a size 30 

BISW centrifugal fan is 

to deliver 17,750 CFM at 

10.0 in. static pressure. 

Elevation is 3000 feet, 

temperature is 150°F. 

The 10.0 in. static 

pressure refers to the 

0 

50 

0.87 

0.96 

0.90 

1.00 

0.94 

1.04 

0.97 

1.08 

1.01 

1.11 

1.05 

1.15 

1.08 

1.20 

1.13 

1.24 

1.17 

1.30 

1.22 

1.34 

1.26 

1.40 

1.31 

1.45 

1.37 

1.51 

1.43 

1.57 

1.48 

1.63 

1.54 

1.70 

static pressure at the 

operating air density, in 

this case at 3000 feet, 

70 

100 

1.00 

1.06 

1.04 

1.10 

1.08 

1.14 

1.12 

1.18 

1.16 

1.22 

1.22 

1.27 

1.25 

1.32 

1.30 

1.37 

1.35 

1.42 

1.40 

1.48 

1.45 

1.54 

1.51 

1.60 

1.57 

1.66 

1.64 

1.74 

1.70 

1.80 

1.77 

1.88 

150°F. Intuitively, we 150 1.15 1.19 1.24 1.30 1.33 1.38 1.44 1.49 1.55 1.61 1.67 1.74 1.81 1.89 1.96 2.04 

realize that at higher 

than standard 

200 1.25 1.29 1.34 1.40 1.44 1.50 1.56 1.61 1.68 1.75 1.81 1.89 1.96 2.05 2.13 2.21 

elevations and 

250 1.34 1.39 1.44 1.50 1.55 1.61 1.67 1.74 1.80 1.88 1.95 2.02 2.10 2.20 2.28 2.37 

temperatures, air 

density will be lower 

than standard. 

300 

350 

1.43 

1.53 

1.49 

1.58 

1.54 

1.64 

1.60 

1.71 

1.66 

1.77 

1.72 

1.84 

1.79 

1.91 

1.86 

1.98 

1.93 

2.06 

2.01 

2.14 

2.08 

2.22 

2.16 

2.31 

2.25 

2.40 

2.35 

2.51 

2.43 

2.60 

2.53 

2.71 

Therefore, we must 

determine what static 

pressure at standard air 

400 

500 

1.62 

1.81 

1.68 

1.88 

1.75 

1.95 

1.81 

2.02 

1.88 

2.10 

1.94 

2.18 

2.03 

2.26 

2.09 

2.35 

2.19 

2.44 

2.27 

2.54 

2.37 

2.63 

2.45 

2.73 

2.54 

2.84 

2.66 

2.97 

2.75 

3.08 

2.87 

3.20 

density will equate to 600 2.00 2.07 2.15 2.23 2.31 2.40 2.50 2.59 2.69 2.84 2.91 3.02 3.14 3.28 3.40 3.54 

10.0 in. static pressure 

at our operating density. 

Since standard air 

700 

800 

2.19 

2.38 

2.27 

2.48 

2.35 

2.57 

2.44 

2.67 

2.53 

2.76 

2.63 

2.86 

2.73 

2.98 

2.83 

3.09 

2.94 

3.21 

3.07 

3.33 

3.17 

3.45 

3.31 

3.59 

3.44 

3.74 

3.59 

3.90 

3.72 

4.05 

3.88 

4.21 

density is greater than 

operating air density in 

this case, we would 

expect the corrected 

900 

1000 

2.56 

2.76 

2.66 

2.87 

2.76 

2.989 

2.87 

3.09 

2.97 

3.20 

3.07 

3.31 

3.20 

3.45 

3.33 

3.59 

3.46 

3.73 

3.58 

3.86 

3.71 

4.00 

3.87 

4.17 

4.02 

4.33 

4.20 

4.53 

4.35 

4.69 

4.53 

4.89 

static pressure to be greater than the operating static pressure. 

The accompanying table gives air density correction factors for non-standard temperatures and elevations. 

The example below shows the relationship of fan performance at sea level and at 3000 ft. elevation and 150°F. 

EXAMPLE 

Air 

Temp. 

°F 

The following example shows how to properly select the fan described above: 

1. Since the air volume delivered by the fan is not affected 

by density, airflow remains 17,750 CFM. 

2. Determine correction factor from chart for an elevation of 

3000 feet and air temperature of 150°F. The correction 

factor is 1.30. 

3. Multiply the specified operating static pressure by the 

correction factor to determine the standard air density 

equivalent static pressure (Corrected static pressure = 

10.0 in. x 1.30 = 13.0 in. Ps). 

4. Refer to the fan performance table for a 30 BISW. 

At 17,750 CFM and 13.0 in. Ps: Fan RPM = 2012, 

BHP = 49.8. 

5. 2012 Fan RPM is required to produce the desired 

performance. 

6. Since the horsepower selected refers to standard air 

density, this must be corrected to reflect actual BHP at 

the lighter operating air. Operating BHP = standard BHP 

÷ 1.30, or 49.8 ÷ 1.30 = 38.3 BHP. 

If a fan is selected to operate at high temperatures, the 

motor must be of sufficient horsepower to handle the 

increased load at any lower operating temperature where 

the air is more dense. Assume the air entering the 30 BISW 

fan at start-up is 0°F. For 0°F and 3000 feet elevation the air 

density correction factor is 0.97. BHP at 0°F = 49.8 ÷ 0.97 = 

51.3, therefore, a 75 HP motor is required. 

AIR DENSITY CORRECTION FACTORS 

Elevation (Feet Above Sea Level) 

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 

Ps 

25 

20 

15 

10 

5 

49.8 BHP 

10.0 in. Ps 

Sea Level, 70 - Static Pressure 

Sea Level, 70 - BHP 

3000 ft., 150 - Static Pressure 

3000 ft., 150 - BHP 

17,750 

CFM 

38.3 BHP 

13.0 in. Ps 

0 

10 

0 5 10 15 20 25 30 35 40 

CFM x 1000 

60 

50 

40 

30 

20 

BHP 

GREENHECK 

® 

5

Effect Of Installation On Performance 

6 

Ratings presented in the performance tables and curves of this 

catalog were derived from tests made in accordance with AMCA 

Standard 210 – “Laboratory Methods of Testing Fans for 

Ratings.” The AMCA test procedure utilizes an open inlet and a 

straight outlet duct to assure maximum static regain. 

Any installation with inlet or discharge configurations that deviate 

from this standard may result in reduced fan performance. 

Restricted or unstable flow at the fan inlet can cause pre-rotation 

of incoming air or uneven loading of the fan wheel yielding large 

system losses and increased sound levels. Free discharge or 

turbulent flow in the discharge ductwork will also result in 

system effect losses. 

Static pressure losses due to inlet and discharge conditions can 

be expressed in terms of system effect factors. The static 

pressure for selection of the fans equals the system static 

pressure plus the system effect factor. 

Some common inlet and discharge conditions which affect fan 

performance are: 

NON-DUCTED INLET CLEARANCE 

Installation of a fan with an open inlet too close to a wall or 

bulkhead will cause reduced fan performance. It is desirable to 

have one fan wheel diameter if possible and a minimum of three 

fourths of a wheel diameter between the fan inlet and the wall. 

System effect curve #3 depicts the pressure loss for one-half 

wheel diameter clearance. 

FREE DISCHARGE 

Free or abrupt discharge into a plenum results in a reduction in 

fan performance. The effect of static regain in discharge is not 

realized. System effect curve #2 depicts the pressure loss for 

free or abrupt discharge. 

INLET DUCT TURNS 

Turning 

Vanes 

1 Fan 

Wheel 

Dia. 

1 Fan 

Wheel 

Dia. 

GOOD POOR 

Installation of a duct turn or elbow too close to the fan inlet 

reduces fan performance because the air is loaded unevenly into 

the fan wheel. To achieve full fan performance there should be at 

least one fan wheel diameter between the turn or elbow and the 

fan inlet. Curve #1 shows the system effect factor when less than 

one diameter is provided. Note: Use of an inlet box in lieu of a 

turn or elbow significantly reduces system effect. 

INLET SPIN 

Inlet spin is a frequent cause of reduced fan performance. The 

change in fan performance is a function of the intensity of spin 

and not easily defined. The best solution is proper duct design 

and airflow patterns. 

DISCHARGE DUCT TURNS 

Duct turns located near the fan discharge should always be in 

the direction of the fan rotation. 

Fan performance is reduced when duct turns are made 

immediately off the fan discharge. To achieve cataloged fan 

performance there should be at least three equivalent duct 

diameters of straight ductwork between the fan discharge and 

any duct turns. Curve #4 shows the system effect factor for two 

diameters of straight ductwork and curve #2 for one diameter. 

SYSTEM EFFECT FACTOR CURVES 

STATIC PRESSURE LOSS 

1.2 

1.0 

0.8 

0.6 

0.4 

0.2 

0.0 

Rotation 

Rotation 

POOR 

Rotation 

POOR 

Turning 

Vanes 

Length of Straight Duct 

GOOD 

CURVE 1 

Rotation 

GOOD 

CURVE 2 

CURVE 3 

CURVE 4 

0 5 10 15 20 25 30 35 40 45 

FPM X 100 

OUTLET VELOCITY 

Additional information on system effect factors can be found in 

AMCA Publication 201 – “Fans and Systems” and ASHRAE 

Handbooks. 

GREENHECK 

®

Sound Performance Data 

AMCA Licensed Ratings 

Sound tests of Model BISW were conducted in Greenheck's AMCA Registered sound laboratory in accordance with AMCA Standard 300. 

Inlet and outlet sound ratings comply with AMCA Publication 311, qualifying these models to bear the AMCA seal for sound and air 

performance. The sound power levels published here can be compared directly with those of other similarly rated fans, or used as a 

baseline to determine sound levels in occupied spaces. 

The sound data in this brochure is the result of extensive testing, which included both inlet and outlet sound tests on single width 

centrifugal fans. Typically, fan manufacturers publish only inlet sound for single width fans. The assumption they make is that outlet sound is 

identical to inlet sound. Sound data based on this assumption is simply not accurate enough for today's sound sensitive installations. This 

assumption also ignores duct end corrections for outlet sound. 

Test Methods 

AMCA Standard 300 clearly defines methods used to test fans in a reverberant sound test room. The reverberant room is specifically 

designed to allow sound waves to be dispersed evenly throughout the room. The walls have a hard surface that reflects sound and are 

positioned to prevent resonances which could result in quiet areas within the room. 

Sound power cannot be directly measured. The test method is based on a Reference Sound Source (RSS) substitution for determining fan 

sound power. The RSS is a laboratory calibrated device which has a known sound power output level. The test fan is installed as shown 

below. The RSS is energized and the sound pressure levels in the reverberant room are recorded. The fan is then operated without the RSS 

and the fan sound pressure levels are recorded for various points of operation. Since the sound power levels of the RSS are known, the 

substitution method is used to determine the sound power levels of the fan. This method is illustrated in the following example. 

Octave Band 1 2 3 4 5 6 7 8 

Center Frequency (Hz) 63 125 250 500 1000 2000 4000 8000 

Calibrated RSS Sound Power (Lwr) 82 81 81 81 81 81 79 78 

Measured RSS Sound Pressure (Lpq) 70 74 75 76 75 74 69 61 

Difference (Lwr-Lpq) 12 7 6 5 6 7 10 17 

Measured Fan Sound Pressure (Lpm) 68 72 69 69 68 62 57 46 

Substitution (Lwr-Lpq, from above) +12 +7 +6 +5 +6 +7 +10 +17 

Fan Sound Power (Lw) 80 79 75 74 74 69 67 63 

Test Setups 

The illustrations at right show where the sound levels were measured 

with respect to the fan. Inlet sound was tested as in Figure 2 of 

Standard 300 and outlet sound was tested as in Figure 3. Inlet and 

outlet sound were determined in the same inlet and outlet 

configurations as the air tests. (Installation Type B - free inlet, ducted 

outlet.) 

Calculating Fan Sound Power 

Interpreting Sound Data 

Sound power levels in this brochure are presented as dB (re 10 -12 

watts) in each of the eight full octave bands with center frequencies 

from 63 Hz to 8000 Hz. They are also presented as a single A-weighted 

sound power level, LwA. Charts are provided covering the full range of 

fan speeds and percent wide open volume (%WOV) for each fan size. 

Outlet sound power data is based on a ducted outlet and therefore 

includes duct end reflection corrections. 

Airflow 

Fan 

Reference 

Sound 

Source 

Microphone 

Path 

Reverberant 

Room 

AMCA Standard 300 - Figure 2: Fan Inlet Sound Testing 

Installation Type B: Free Inlet, Ducted Outlet 

Fan Airflow 

Reference 

Sound 

Source 

Microphone 

Path 

Reverberant 

Room 

AMCA Standard 300 - Figure 3: Fan Outlet Sound Testing 

Installation Type B: Free Inlet, Ducted Outlet 

(Ratings include the effects of duct end correction) 

Units in 

dB 

GREENHECK 

® 

7

Outlet Sound - Duct End Corrections 

This correction accounts for sound that is reflected back 

into the duct where there is an abrupt termination of the 

duct. 

AMCA Standard 300 requires that outlet sound power for 

fans with ducted outlets include Duct End Corrections. 

These corrections account for any sound power that may be 

present in the duct but is not measured in the reverberant 

room, because it is reflected back into the duct at the 

discharge. 

Duct end corrections are included in all outlet sound power 

ratings. 

Tolerance and Application 

The certification process in AMCA Standard 311 call for a precertification test to verify original test results. Check tests are also required 

every 3 years for each model licensed. Test data must agree with the published sound power within the following tolerance levels: 

These tolerance levels are a good indication of the variance that could occur from one fan or test setup to another. Once installed, 

however, there are many other factors that can affect the sound power generated by a fan. 

The lower frequencies (below 125 Hz) are greatly affected by vibration. Fan wheel balance, motor balance, drive alignment, etc., all affect 

the vibration level of the fan and can increase sound power in the 1st and 2nd octaves. When ducts are not properly isolated from the fan, 

these vibrations can be transmitted into the ducts, which can generate additional low frequency sound. 

Sound power generated by a fan can also be influenced by system effects. System effects are pressure losses caused by inlet or outlet 

restrictions, or other conditions causing non-uniform airflow at the inlet or discharge of a fan (see AMCA publication 201). Examples 

include inlet or outlet elbows too close to a fan, restricted inlets, and fan accessories. While system effects can prevent fans from 

reaching their designed air performance, they can also result in increased sound power levels. Typically, system effects cause pressure 

fluctuations which influence the lower frequencies. Poor inlet conditions can also greatly increase sound levels at the blade passage 

frequency (BPF). The blade passage frequency refers to how often a blade or wheel fin passes a stationary location of the housing and 

can be calculated using the following equation: 

Sound is becoming increasingly critical for most fan installations. Greenheck employs extensive research and testing to provide sound 

data that is as thorough and accurate as possible. However, sound pressure levels in occupied spaces are affected by the acoustical 

qualities of the space, distance from source to receiver, etc. Therefore, published sound power data can be used only as a baseline for 

determining the resulting sound pressure levels an occupant hears. While Greenheck provides products which meet published sound 

power levels, no manufacturer can be responsible for poor installations or system designs beyond their control. For further information on 

installation practices, see AMCA publication 201, “Fans and Systems.” 

Sound Power 

Sound power data is charted for the full range of RPM and percent wide open volume (% WOV) for belt drive and RPM and static 

pressure for direct drive in each unit size. 

The % WOV is a convenient way to indicate the operating point (pressure and CFM) for a given fan RPM. To calculate the % WOV for a 

given fan size, use the equation given on the performance page. 

8 

Size 

63 Hz 

Single Width Fans 

125 Hz 250 Hz 

18 9 5 2 

20 9 4 1 

22 8 4 1 

24 7 3 

27 6 3 

30 6 2 

33 5 2 

36 5 2 

40 4 1 

44 4 1 

49 3 

54 3 

60 2 

66 2 

73 2 

BPF (Hz) = Fan RPM x Number of Blades (All Greenheck wheels have 9 blades) 

60 

% WOV = 

CFM x 100 

RPM x K 

Duct End Corrections (dB) 

Octave Band 1 2 3 4 5 6 7 8 

Center Frequency (Hz) 63 125 250 500 1000 2000 4000 8000 

Tolerance +6 +3 +3 +3 +3 +3 +3 +3 

Use the following procedure to calculate sound data for a specific Fan RPM and % WOV: 

1. Determine the eight sound power levels for the specified % WOV using the higher Fan RPM shown. 

2. Determine the eight sound power levels for the specified % WOV using the lower Fan RPM shown. 

3. Interpolate between the higher and lower sound power levels using the specified RPM. 

GREENHECK 

®

Belt Drive Fan Selection Procedure 

An important point to remember when manually selecting a centrifugal fan is that more than one fan is available to meet the 

desired performance (CFM and Ps). Selection criteria such as unit size, efficiency, speed, outlet velocity, horsepower, or 

construction material may also dictate which fan to select. 

Abelt drive performance page exists for each wheel diameter (18 - 73 inches) which includes fan curves and tabular 

performance for both air and sound. See page 36 for complete model number code. 

Belt Drive Fan Selection Example 

Enter the performance table with the desired CFM and Ps. Obtain the fan RPM, brake horsepower (BHP) and class 

requirements. Verify the required motor HP by using the performance graph. 

For this example, select 44300 CFM at 15 inches static pressure. From the table we get a fan RPM of 1444, requiring 

134 BHP with class IV construction. Go to the graph and verify the operating point, motor HP and the fan class. Our 

example confirms that we will be using a class IV fan with a 150 HP motor. 

44 BISW 

Performance Data 

Wheel Diameter = 44 1/2 in. 

Outlet Area = 11.39 ft 2 

Tip Speed = 11.65 x RPM 

Maximum BHP = (RPM/276) 3 

For belt driven applications over 250 Hp, 

consult factory 

Pressure Class Limits 

Class Max. RPM 

III 1392 

IV 1675 

Static Pressure in Inches 

CFM OV 10 11 12 13 14 15 16 17 18 

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 

37700 3309 1198 77.3 1236 84.1 1274 90.9 1311 97.9 1346 105 1389 113 1429 121 1468 130 1505 138 

39900 3503 1219 82.9 1259 90.0 1297 97.2 1332 105 1367 112 1401 119 1438 127 1477 136 1514 144 

42100 3696 1244 89.1 1281 96.3 1318 104 1355 111 1389 119 1422 127 1455 134 1487 142 1523 151 

44300 3889 1270 95.6 1306 103 1341 111 1376 119 1411 126 1444 134 1476 142 1508 150 1538 159 

46500 4082 1295 102 1331 110 1366 118 1399 126 1433 134 1466 142 1497 151 1529 159 1559 168 

48700 4275 1322 110 1357 118 1391 126 1424 134 1456 143 1488 151 1520 160 1551 168 1580 177 

50900 4468 1348 117 1383 126 1417 134 1449 143 1481 151 1512 160 1542 169 1573 178 1603 187 

53100 4661 1376 125 1410 134 1443 143 1475 152 1507 161 1537 169 1567 178 1595 188 1624 197 

55300 4855 1405 133 1437 142 1470 152 1501 161 1532 170 1562 179 1592 189 1620 198 1648 207 

57500 5048 1435 141 1466 151 1496 161 1528 170 1558 180 1588 190 1617 199 1645 209 

59700 5241 1465 150 1496 160 1525 170 1555 180 1585 190 1614 200 1643 210 

61900 5434 1498 160 1525 170 1555 180 1584 191 1612 201 1641 211 

Performance shown is for model BISW arrangement 1, installation Type B - free inlet, ducted outlet. 

Performance ratings do not include the effects of appurtenances in the airstream. 

Power rating (BHP) does not include drive losses. 

Sound Power [dB Ref 10-12 watts] 

INLET SOUND POWER, Lwi 

RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1000 100 106 111 104 98 96 95 88 82 103 

80 101 109 99 94 92 89 83 79 99 

60 99 106 96 90 90 87 85 82 96 

50 101 107 96 89 89 87 85 83 96 

40 109 109 100 92 90 88 86 83 99 

1392 100 112 117 117 108 104 103 98 92 112 

80 107 114 114 103 100 98 93 88 109 

60 104 111 110 100 97 96 93 90 106 

50 106 112 111 99 96 95 93 91 106 

40 115 117 114 103 98 96 94 92 109 

1675 100 115 121 120 114 109 107 104 97 117 

80 110 117 117 110 105 103 99 94 113 

60 107 114 114 107 102 100 98 95 110 

50 110 116 114 106 101 99 98 96 110 

40 118 121 117 110 103 101 99 96 113 

20 

RPM BHP 

1586 162 

1595 169 

1603 176 

1618 184 

1639 194 

% WOV = (CFM x 100) / (RPM x 51.4) 

- Wheel Diameter 

OUTLET SOUND POWER, Lwo 

- Outlet Area; used to calculate 

Outlet Velocity (OV) 

RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1000 100 113 115 107 103 100 98 92 85 107 

80 110 112 102 99 96 92 87 81 102 

60 105 110 100 96 92 89 85 81 100 

50 106 109 99 95 91 88 85 82 99 

40 107 108 98 94 90 87 85 82 98 

1392 100 119 121 119 112 109 107 102 96 116 

80 116 118 115 108 104 101 96 91 112 

60 111 115 114 105 101 98 94 90 109 

50 112 115 113 104 100 96 94 90 108 

40 113 115 112 103 99 95 93 90 107 

1675 100 123 125 123 118 114 111 108 102 121 

80 119 122 119 114 109 106 102 96 116 

60 114 118 117 111 106 103 99 95 114 

50 115 118 116 111 105 101 98 95 113 

40 116 118 115 110 104 100 98 95 112 

The sound power level ratings shown are in decibels, referred to 10 -12 watts calculated per AMCA Standard 301. Values shown are for inlet Lwi, LwiA 

and outlet Lwo, LwoA sound power levels for installation Type B: free inlet, ducted outlet. Outlet ratings include the effects of duct end correction. 

20 

1392 

GREENHECK 

® 

Enter the Fan Sound Table 

with the Fan RPM from the 

performance table and the 

% WOV from the equation. 

Obtain the eight octave 

ratings for inlet (Lwi) and 

Outlet (Lwo) Sound Power. 

EXAMPLE 

For this example, the %WOV 

value is 60 and the eight 

octave ratings are to be 

interpolated between the two 

sets of RPM values. See page 

8 for details. 

NOTE: The % WOV for your 

desired performance can be 

found using the equation at 

the top of the Sound Power 

Table. 

If the RPM and %WOV can 

not be found in the chart, the 

eight octave ratings can then 

be found using interpolation. 

Additional Information 

on Performance Page 

CFM 

OV= 

OA 

- Equation for tip speed 

- Max. BHP for fan at 

specified RPM 

- Most efficient selections 

shown with bolded 

values 

- Wheel class used to 

meet performance 

- Max. class wheel RPM 

GREENHECK 

® 

9

Direct Drive Fan Selection Procedure 

10 

Most direct drive applications will have multiple fan size and RPM selections which will satisfy the design requirements. 

Selections can be narrowed further by RPM or horsepower restrictions, sound criteria or space restrictions. 

The direct drive performance graphs contain fan wheel sizes ranging from 30 to 73 inch diameters and RPMs ranging 

from 870 to 1770. All fan sizes and RPMs have fan performance curves in 5 percent increments from a full width wheel 

down to a 50% wheel width. Both static pressure vs. CFM (shown as solid lines) and brake horsepower vs. CFM (dashed 

lines) are depicted. 

Inlet and outlet sound power is shown for all fan sizes and RPMs. Tables of sound power for direct drive fans are found starting 

on page 32. Sound power for each selection can be determined by matching fan RPM with the system static pressure. 

See page 36 for complete model number code. 

Direct Drive Fan Selection Example 

Enter the performance graph with the desired CFM and Ps. Obtain the percentage wheel width and brake horsepower 

requirements. 

For this example, select 40,000 CFM at 6 inches static pressure which is shown as 'A'. The static vs CFM curve (solid 

line) that satisfies this point of operation has a wheel width of 85%. To determine the brake horsepower, find the 

intersection of the brake horsepower vs. CFM curve (dashed line) for a 85% wheel at 40000 CFM (point 'B'). Read the 

brake horsepower value from the right side of the table. For this selection, the brake horsepower is approximately 66. A 

75 horsepower motor or larger is required. See pages 3 and 4 to find motor frame sizes and check minimum 

and maximum motor frame size for Arr. 4 and 8. 

44 BISWD 

44 BISWD 



III 1392 


Wheel Diameter 44 1/2 in. 

Outlet Area 11.39 ft. 2 

Inlet Sound Power, Lwi Outlet Sound Power, Lwo 

RPM Ps 1 2 3 4 5 6 7 8 LwiA RPM Ps 1 2 3 4 5 6 7 8 LwoA 

1170 2 107 113 108 101 99 97 91 85 106 1170 2 115 117 111 106 102 100 95 88 110 

4 106 112 107 100 97 95 89 84 105 4 114 116 110 105 101 98 93 87 108 

6 104 112 106 98 96 93 88 83 103 6 113 115 108 103 99 96 91 85 107 

8 102 110 104 96 94 92 88 84 102 8 110 113 107 101 98 94 90 85 105 

10 102 109 102 94 93 91 88 86 100 10 108 112 106 100 96 92 89 85 104 

B 

x 

x 

A 

Sound Power [dB Ref 10 -12 watts] 

Determining Inlet and 

Outlet Sound 

Enter the fan sound table with 

the Fan RPM and static 

pressure. For this example, 

the eight octave ratings are 

circled in the table below. 

Tables for direct drive sound 

power levels are found 

starting on page 32. 

Note: If the static pressure is 

not indicated in the chart, the 

eight octave ratings can be 

interpolated. 

Additional Information 

on Performance Graph 

-Wheel Diameter 

-Outlet Area; used to calculate 

Outlet Velocity (OV) 

CFM 

OV= 

OA 

-Wheel class used to meet 

performance 

-Max. class wheel RPM 

GREENHECK 

®

18 BISW 






Pressure Class Limits 3450 


III 3450 



CFM OV 10 11 12 13 14 15 16 17 18 

20 

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 

5700 2968 2886 12.4 2990 13.6 3090 14.9 3196 16.2 3299 17.6 3397 19.0 3493 20.4 3585 21.8 3675 23.2 

6150 3203 2943 13.5 3047 14.8 3146 16.1 3242 17.4 3333 18.7 3432 20.1 3528 21.6 3620 23.1 3709 24.6 3881 27.6 

6600 3437 3007 14.7 3105 16.0 3204 17.3 3298 18.7 3390 20.1 3478 21.5 3563 22.9 3655 24.4 3744 26.0 3916 29.1 

7050 3671 3075 15.9 3171 17.3 3263 18.7 3356 20.1 3447 21.5 3534 23.0 3619 24.5 3702 25.9 3782 27.4 3951 30.7 

7500 3906 3143 17.2 3239 18.7 3331 20.1 3419 21.6 3504 23.1 3592 24.6 3676 26.1 3758 27.7 3838 29.2 3991 32.4 

7950 4140 3217 18.7 3308 20.2 3399 21.7 3487 23.2 3571 24.8 3652 26.3 3734 27.9 3816 29.5 3895 31.1 4047 34.4 

8400 4375 3293 20.2 3382 21.7 3468 23.3 3555 24.9 3639 26.5 3720 28.1 3799 29.8 3874 31.4 3952 33.1 4104 36.5 

8850 4609 3370 21.8 3458 23.4 3543 25.1 3626 26.7 3707 28.4 3788 30.0 3866 31.7 3942 33.4 4015 35.2 

9300 4843 3449 23.5 3535 25.2 3619 26.9 3701 28.6 3779 30.3 3857 32.0 3934 33.8 4010 35.6 4083 37.4 

9750 5078 3539 25.4 3614 27.1 3696 28.9 3777 30.6 3855 32.4 3931 34.2 4004 36.0 4078 37.8 

10200 5312 3630 27.4 3704 29.2 3776 30.9 3854 32.8 3931 34.6 4006 36.5 4079 38.3 

10650 5546 3722 29.5 3795 31.3 3866 33.2 3934 35.0 4008 36.9 4082 38.8 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

2500 100 96 95 97 102 96 96 93 83 103 

80 95 94 95 101 93 91 87 80 100 

60 94 92 93 98 91 89 85 81 98 

50 96 93 95 98 91 89 86 83 98 

40 99 96 96 96 90 89 86 83 97 

3450 100 102 105 105 108 106 103 101 94 111 

80 101 103 103 107 104 99 96 90 108 

60 100 102 101 104 101 97 94 90 106 

50 102 103 102 104 101 97 95 91 106 

40 105 106 105 103 100 96 94 92 105 

4160 100 105 109 110 111 110 108 106 100 115 

80 104 108 108 110 109 104 101 95 113 

60 104 107 106 108 106 102 99 95 110 

50 105 108 107 108 106 102 99 96 111 

40 108 111 110 108 105 101 99 96 110 

% WOV = (CFM x 100) / (RPM x 3.60) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

2500 100 107 103 101 106 99 99 96 87 106 

80 106 99 97 102 97 94 90 82 103 

60 104 95 96 98 94 91 86 81 99 

50 104 96 96 96 93 89 85 80 98 

40 108 98 96 96 92 88 85 80 98 

3450 100 113 112 109 111 109 106 105 98 114 

80 112 109 105 108 106 102 99 93 110 

60 110 106 102 104 103 99 95 90 107 

50 110 107 103 102 101 98 94 90 106 

40 114 110 104 102 101 97 93 89 106 

4160 100 116 116 114 115 114 111 109 104 118 

80 116 114 110 111 111 107 104 99 115 

60 114 111 108 108 107 105 101 96 112 

50 114 112 108 106 105 103 99 95 110 

40 118 115 110 107 105 102 98 94 110 



GREENHECK 

® 

11

20 BISW 


Wheel Diameter = 20 in. 






III 3147 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


6700 2913 2620 14.6 2715 16.0 2811 17.5 2909 19.1 3002 20.8 3092 22.4 3179 24.1 3264 25.8 

7230 3143 2671 15.9 2766 17.4 2857 18.9 2944 20.4 3034 22.1 3123 23.8 3210 25.5 3295 27.3 3376 29.1 3533 32.7 

7760 3373 2726 17.2 2817 18.8 2908 20.4 2994 22.0 3078 23.6 3158 25.2 3242 27.0 3326 28.8 3408 30.7 3564 34.5 

8290 3604 2786 18.6 2874 20.3 2959 21.9 3046 23.6 3129 25.3 3209 27.0 3287 28.8 3362 30.5 3439 32.3 3595 36.3 

8820 3834 2847 20.2 2935 21.9 3019 23.6 3099 25.3 3180 27.1 3260 28.9 3337 30.7 3412 32.5 3485 34.4 3625 38.1 

9350 4065 2911 21.8 2996 23.6 3079 25.4 3160 27.2 3237 29.0 3312 30.8 3389 32.7 3463 34.6 3536 36.6 3675 40.4 

9880 4295 2979 23.5 3061 25.4 3141 27.2 3220 29.1 3297 31.0 3372 32.9 3443 34.9 3515 36.8 3587 38.8 3726 42.9 

10410 4526 3047 25.4 3128 27.3 3206 29.2 3282 31.2 3358 33.2 3432 35.1 3504 37.2 3573 39.2 3640 41.2 

10940 4756 3116 27.4 3196 29.4 3274 31.4 3349 33.4 3421 35.4 3493 37.5 3564 39.5 3633 41.6 3701 43.8 

11470 4986 3193 29.5 3266 31.5 3342 33.6 3416 35.7 3488 37.8 3557 39.9 3626 42.1 3694 44.2 3761 46.4 

12000 5217 3274 31.8 3343 33.9 3411 36.0 3485 38.2 3555 40.3 3624 42.5 3691 44.7 3756 46.9 

12530 5447 3356 34.2 3423 36.4 3488 38.5 3554 40.7 3624 43.0 3692 45.3 3758 47.5 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

2200 100 96 95 98 101 96 95 91 81 102 

80 95 94 96 99 92 90 85 78 99 

60 94 92 94 97 91 88 85 81 97 

50 95 93 95 97 91 89 85 82 97 

40 98 96 96 95 90 88 86 83 97 

3147 100 104 105 105 109 106 104 102 94 111 

80 103 104 104 108 103 99 96 90 109 

60 102 103 102 105 101 98 94 90 106 

50 104 103 103 105 101 98 95 91 107 

40 107 107 105 104 100 97 95 92 106 

3794 100 107 110 110 112 111 108 106 100 116 

80 106 109 109 111 109 104 101 95 113 

60 105 108 107 109 106 103 99 96 111 

50 107 109 108 109 106 103 100 96 111 

40 110 112 111 108 105 102 99 97 111 

% WOV = (CFM x 100) / (RPM x 4.74) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

2200 100 106 103 102 105 99 98 95 85 106 

80 105 99 99 101 96 93 89 80 102 

60 103 95 96 98 94 90 85 80 99 

50 103 96 95 95 92 89 84 79 97 

40 106 98 96 95 91 87 84 80 97 

3147 100 114 112 109 113 109 107 105 98 115 

80 114 109 105 109 106 103 99 92 111 

60 112 106 103 105 103 100 96 90 108 

50 112 106 103 103 101 98 94 90 106 

40 116 109 105 103 101 97 94 90 106 

3794 100 117 117 114 116 114 111 110 104 119 

80 117 114 110 112 111 108 104 98 115 

60 115 111 108 109 108 105 101 96 112 

50 115 112 108 107 106 103 100 95 111 

40 119 115 110 107 106 102 99 95 111 



12 

3147 

GREENHECK 

®

22 BISW 








III 2830 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


8600 3017 2377 18.8 2463 20.6 2544 22.4 2629 24.4 2713 26.4 2794 28.5 2872 30.6 2948 32.8 3022 35.0 

9250 3245 2423 20.4 2508 22.3 2590 24.2 2668 26.2 2743 28.1 2822 30.2 2900 32.4 2976 34.6 3049 36.9 3190 41.5 

9900 3473 2475 22.1 2555 24.1 2636 26.1 2713 28.1 2788 30.2 2860 32.2 2930 34.3 3004 36.6 3077 38.9 3218 43.7 

10550 3701 2529 23.9 2609 26.0 2684 28.0 2759 30.2 2834 32.3 2906 34.5 2975 36.7 3043 38.9 3109 41.1 3245 45.9 

11200 3929 2584 25.8 2663 28.0 2738 30.1 2811 32.3 2880 34.6 2952 36.8 3021 39.1 3088 41.4 3153 43.7 3279 48.4 

11850 4157 2643 27.9 2717 30.1 2792 32.4 2864 34.7 2934 37.0 3001 39.3 3067 41.7 3134 44.0 3199 46.5 3324 51.3 

12500 4385 2704 30.1 2777 32.4 2848 34.7 2919 37.1 2988 39.5 3054 41.9 3119 44.4 3181 46.8 3245 49.3 3369 54.4 

13150 4614 2765 32.4 2838 34.8 2908 37.3 2975 39.7 3042 42.2 3108 44.7 3173 47.2 3235 49.8 3295 52.3 

13800 4842 2828 34.9 2899 37.4 2968 39.9 3035 42.5 3100 45.0 3163 47.6 3227 50.2 3289 52.8 3349 55.5 

14450 5070 2900 37.6 2962 40.2 3029 42.8 3096 45.4 3160 48.0 3222 50.7 3282 53.3 3343 56.0 

15100 5298 2972 40.5 3033 43.1 3092 45.7 3157 48.5 3220 51.2 3282 53.9 3342 56.7 

15750 5526 3045 43.5 3105 46.2 3164 49.0 3220 51.7 3282 54.5 3343 57.3 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

2000 100 97 97 100 101 97 96 91 81 103 

80 96 95 99 100 93 91 85 78 100 

60 95 94 96 97 92 89 85 81 98 

50 96 95 97 97 92 89 86 83 98 

40 99 97 97 96 91 89 86 83 97 

2830 100 106 106 106 110 106 105 102 93 112 

80 105 105 104 110 103 100 96 90 109 

60 104 103 103 107 101 98 95 91 107 

50 106 104 104 107 101 98 95 92 107 

40 109 107 106 105 100 98 95 92 107 

3413 100 109 111 111 114 111 109 107 100 116 

80 108 110 109 113 109 105 101 95 114 

60 108 109 108 110 107 103 100 96 112 

50 109 110 109 110 106 103 100 97 112 

40 112 113 111 109 105 102 100 97 111 

% WOV = (CFM x 100) / (RPM x 6.52) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

2000 100 107 104 104 105 100 99 95 85 106 

80 105 99 101 102 97 94 89 80 103 

60 102 97 98 98 94 91 86 80 99 

50 103 97 96 96 93 89 85 80 98 

40 106 99 97 96 92 88 84 80 98 

2830 100 115 112 110 114 109 107 106 97 115 

80 115 109 106 111 106 103 100 92 112 

60 113 105 104 107 104 100 96 90 108 

50 113 106 104 104 102 99 95 90 107 

40 117 109 105 105 101 98 94 90 107 

3413 100 119 117 115 117 114 112 110 104 120 

80 118 114 111 114 112 108 105 98 116 

60 116 111 109 110 108 105 101 96 113 

50 116 112 109 108 107 104 100 95 111 

40 120 115 110 108 106 103 99 95 111 



2830 

GREENHECK 

® 

13

24 BISW 






Pressure Class Limits 2580 


III 2580 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


12050 3492 2256 26.5 2332 29.0 2404 31.5 2477 34.1 2548 36.6 2617 39.2 2683 41.8 2747 44.5 2810 47.2 

12850 3724 2305 28.6 2376 31.1 2449 33.8 2518 36.4 2585 39.1 2654 41.8 2720 44.6 2784 47.3 2846 50.1 2966 55.7 

13650 3956 2357 30.8 2427 33.5 2493 36.1 2563 38.9 2629 41.7 2694 44.6 2756 47.4 2821 50.3 2883 53.2 3002 59.0 

14450 4188 2410 33.2 2479 35.9 2546 38.7 2609 41.5 2674 44.4 2738 47.4 2800 50.3 2861 53.4 2919 56.4 3039 62.5 

15250 4420 2466 35.8 2532 38.6 2598 41.5 2662 44.4 2723 47.3 2783 50.3 2845 53.4 2905 56.5 2963 59.7 3075 66.0 

16050 4652 2528 38.5 2589 41.4 2651 44.4 2715 47.4 2776 50.5 2835 53.5 2891 56.6 2949 59.8 3007 63.1 

16850 4884 2590 41.4 2651 44.4 2709 47.5 2768 50.6 2828 53.7 2887 56.9 2944 60.1 2998 63.4 3052 66.6 

17650 5115 2653 44.5 2713 47.6 2771 50.8 2827 54.0 2881 57.2 2940 60.5 2996 63.8 3051 67.1 

18450 5347 2718 47.8 2775 51.0 2832 54.3 2888 57.6 2942 60.9 2994 64.2 3049 67.7 

19250 5579 2787 51.5 2840 54.6 2895 58.0 2950 61.4 3003 64.8 3055 68.2 

20050 5811 2857 55.3 2909 58.6 2960 61.9 3013 65.4 3065 68.9 

20850 6043 2928 59.4 2979 62.8 3028 66.2 3077 69.6 




14 



RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1800 100 98 95 104 97 94 96 92 82 102 

80 94 91 102 93 89 89 85 78 97 

60 94 87 97 89 87 86 84 80 94 

50 95 88 98 87 86 85 84 82 94 

40 98 93 100 89 86 86 85 82 95 

2580 100 105 106 109 110 103 103 102 95 111 

80 101 102 106 106 99 97 95 90 107 

60 101 100 101 102 96 94 93 90 103 

50 102 101 102 102 94 93 93 91 103 

40 105 105 106 104 96 94 93 91 104 

3110 100 108 111 113 113 109 107 106 101 115 

80 104 107 109 110 105 102 99 95 111 

60 104 105 105 105 101 99 97 95 107 

50 105 106 107 105 100 98 97 95 107 

40 108 110 110 107 102 98 97 96 109 

% WOV = (CFM x 100) / (RPM x 8.84) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1800 100 108 105 107 100 99 99 95 86 105 

80 103 102 104 97 96 94 90 82 101 

60 101 99 101 94 93 89 85 81 99 

50 101 99 99 93 91 87 84 81 97 

40 101 99 98 92 90 86 84 82 96 

2580 100 114 114 114 112 107 107 105 99 114 

80 109 110 110 109 104 103 100 94 111 

60 107 108 108 106 102 99 95 91 108 

50 108 108 106 104 100 97 94 91 106 

40 108 108 106 103 99 96 93 91 105 

3110 100 118 118 118 115 112 111 109 104 118 

80 113 114 114 112 109 107 105 100 115 

60 111 112 112 109 107 104 100 96 112 

50 111 112 111 107 105 102 99 96 110 

40 111 112 111 107 104 101 98 95 110 



GREENHECK 

®

27 BISW 








III 2342 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


14650 3496 2048 32.2 2117 35.3 2183 38.4 2249 41.5 2314 44.6 2376 47.7 2436 50.9 2494 54.1 2551 57.3 

15450 3687 2084 34.3 2150 37.4 2216 40.6 2279 43.8 2342 47.1 2404 50.3 2464 53.6 2522 56.9 2578 60.3 2686 67.1 

16250 3878 2123 36.5 2186 39.7 2250 42.9 2312 46.2 2373 49.6 2432 53.0 2492 56.4 2550 59.9 2606 63.3 2714 70.4 

17050 4069 2163 38.8 2226 42.1 2286 45.4 2346 48.8 2406 52.3 2465 55.8 2521 59.3 2576 62.9 2634 66.5 2741 73.7 

17850 4260 2202 41.3 2265 44.7 2326 48.1 2384 51.5 2440 55.0 2498 58.6 2554 62.3 2609 66.0 2662 69.7 2769 77.2 

18650 4451 2246 43.9 2305 47.3 2365 50.9 2423 54.4 2478 58.0 2532 61.6 2587 65.4 2642 69.2 2695 73.0 2796 80.8 

19450 4642 2292 46.6 2348 50.2 2405 53.8 2462 57.4 2517 61.1 2571 64.9 2622 68.6 2675 72.5 2728 76.4 

20250 4832 2338 49.5 2394 53.2 2447 56.9 2502 60.6 2557 64.4 2610 68.2 2662 72.1 2711 76.0 2761 80.0 

21050 5023 2385 52.5 2440 56.3 2493 60.1 2544 63.9 2596 67.8 2649 71.8 2701 75.7 2751 79.7 

21850 5214 2432 55.7 2486 59.6 2539 63.5 2589 67.4 2639 71.4 2689 75.4 2740 79.5 2789 83.6 

22650 5405 2483 59.2 2533 63.0 2585 67.0 2635 71.1 2684 75.2 2731 79.3 2779 83.4 

23450 5596 2534 62.8 2582 66.7 2632 70.8 2682 74.9 2730 79.1 2777 83.3 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1700 100 100 98 106 99 96 97 92 83 103 

80 96 94 104 94 91 90 86 79 99 

60 95 90 99 90 88 87 85 82 96 

50 96 91 100 89 87 87 86 83 96 

40 99 96 102 91 88 87 86 84 97 

2342 100 107 106 111 109 104 104 102 94 111 

80 103 102 108 106 99 98 95 89 107 

60 103 100 103 101 96 95 93 90 103 

50 104 101 104 101 95 94 93 91 103 

40 107 105 107 103 96 95 94 92 105 

2823 100 110 112 114 115 109 108 107 100 116 

80 106 108 111 112 105 102 100 95 112 

60 107 106 107 108 101 99 98 95 109 

50 107 107 108 108 100 98 98 96 108 

40 110 111 111 110 102 99 98 96 111 

% WOV = (CFM x 100) / (RPM x 11.8) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1700 100 109 107 109 101 100 100 96 87 107 

80 104 104 105 98 97 95 91 83 103 

60 102 101 103 96 95 91 86 83 100 

50 103 100 101 94 92 89 86 83 98 

40 103 100 100 93 91 88 86 83 97 

2342 100 116 114 115 111 108 107 105 98 115 

80 111 111 111 108 105 103 100 94 111 

60 109 108 109 106 102 99 95 91 108 

50 109 108 107 104 100 97 94 91 106 

40 109 108 107 103 99 96 94 91 106 

2823 100 119 119 119 118 113 112 110 104 120 

80 114 115 115 115 110 108 105 100 116 

60 112 112 113 112 107 104 100 96 114 

50 113 113 112 111 105 102 99 96 112 

40 112 113 111 110 104 101 98 96 111 



2342 

GREENHECK 

® 

15

30 BISW 








III 2102 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


15050 2911 1755 32.5 1822 35.8 1892 39.4 1960 43.1 2026 46.9 2089 50.7 2150 54.5 2209 58.5 

16400 3172 1788 35.5 1855 39.0 1918 42.5 1979 46.1 2044 49.9 2107 53.9 2168 58.0 2227 62.1 2284 66.2 2394 74.7 

17750 3433 1822 38.6 1888 42.3 1951 46.0 2012 49.8 2071 53.6 2127 57.4 2186 61.5 2245 65.8 2302 70.1 2412 78.9 

19100 3694 1861 42.0 1922 45.7 1985 49.7 2046 53.6 2104 57.6 2160 61.7 2215 65.8 2268 69.9 2319 74.1 2430 83.3 

20450 3955 1907 45.8 1965 49.7 2021 53.6 2079 57.7 2137 61.9 2193 66.1 2248 70.4 2300 74.7 2351 79.1 2450 87.9 

21800 4216 1952 49.8 2011 53.9 2066 58.0 2119 62.1 2171 66.3 2227 70.8 2281 75.3 2334 79.8 2384 84.3 2482 93.5 

23150 4477 2003 54.2 2057 58.4 2111 62.7 2165 67.0 2215 71.4 2265 75.8 2315 80.3 2367 85.0 2418 89.8 

24500 4738 2054 58.8 2108 63.2 2159 67.7 2210 72.2 2261 76.8 2310 81.4 2357 86.0 2404 90.7 2451 95.5 

25850 5000 2107 63.8 2159 68.4 2210 73.0 2259 77.7 2306 82.4 2356 87.2 2403 92.0 2448 96.9 2493 102 

27200 5261 2161 69.0 2212 73.9 2261 78.7 2310 83.5 2357 88.4 2402 93.4 2448 98.4 2494 103 

28550 5522 2220 74.7 2266 79.7 2314 84.7 2362 89.8 2408 94.8 2453 100 2497 105 

29900 5783 2279 80.6 2325 85.8 2369 91.0 2414 96.3 2460 102 2504 107 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1500 100 99 100 105 98 97 97 91 81 103 

80 95 97 103 94 91 90 85 79 99 

60 94 93 98 90 89 87 85 82 95 

50 95 94 99 89 88 87 86 83 95 

40 99 98 101 91 88 88 86 84 97 

2102 100 109 107 113 108 104 105 102 94 112 

80 105 102 110 105 99 99 95 89 107 

60 105 99 106 100 97 96 94 91 104 

50 106 100 107 99 95 95 94 92 104 

40 109 105 109 101 96 95 95 92 105 

2532 100 112 112 115 115 109 109 107 100 117 

80 108 108 113 112 105 103 100 95 112 

60 108 106 108 107 102 100 98 95 109 

50 109 107 109 107 100 99 98 96 108 

40 112 111 112 109 102 100 99 97 110 

% WOV = (CFM x 100) / (RPM x 16.7) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1500 100 109 108 108 102 101 100 95 86 107 

80 105 104 105 99 97 95 90 82 103 

60 102 102 103 96 94 90 86 82 100 

50 103 101 100 94 92 89 86 83 98 

40 103 101 100 93 91 88 86 83 97 

2102 100 117 115 116 111 108 108 106 97 115 

80 112 111 113 108 106 104 100 94 111 

60 110 109 110 105 103 100 95 92 109 

50 111 109 108 104 101 98 95 92 107 

40 111 109 108 102 100 96 94 92 106 

2532 100 120 119 120 117 113 112 111 104 120 

80 115 115 116 114 110 108 105 99 116 

60 113 113 114 112 108 105 101 97 114 

50 114 113 112 110 106 103 99 96 112 

40 114 113 112 109 105 101 99 96 111 



16 

2102 

GREENHECK 

®

33 BISW 








III 1911 



CFM OV 10 11 12 13 14 15 16 17 18 20 


17400 2779 1580 37.7 1648 41.8 1712 46.1 1774 50.5 1833 54.9 1891 59.4 1946 64.0 

19100 3051 1612 41.3 1672 45.4 1731 49.6 1791 54.1 1851 58.7 1908 63.4 1963 68.2 2017 73.1 2069 78.1 

20800 3322 1643 45.1 1704 49.5 1762 53.9 1817 58.3 1870 62.9 1925 67.6 1981 72.6 2034 77.7 2086 82.9 2186 93.4 

22500 3594 1676 49.2 1736 53.8 1793 58.4 1848 63.1 1902 67.9 1953 72.7 2003 77.6 2051 82.5 2104 87.9 2203 98.8 

24200 3865 1720 53.8 1772 58.5 1825 63.2 1880 68.1 1933 73.1 1984 78.2 2034 83.3 2081 88.4 2128 93.7 2220 104 

25900 4137 1763 58.8 1816 63.7 1867 68.6 1914 73.6 1965 78.7 2016 84.0 2065 89.3 2113 94.7 2159 100 2248 111 

27600 4408 1809 64.2 1859 69.3 1909 74.4 1958 79.6 2004 84.8 2049 90.1 2097 95.6 2144 101 2190 107 2279 118 

29300 4680 1858 70.0 1907 75.3 1953 80.6 2001 86.1 2047 91.5 2092 97.0 2134 103 2177 108 2222 114 

31000 4952 1907 76.1 1955 81.7 2001 87.3 2046 92.9 2090 98.6 2135 104 2178 110 2219 116 2259 122 

32700 5223 1959 82.7 2005 88.5 2050 94.3 2094 100 2137 106 2178 112 2221 118 2262 124 

34400 5495 2013 89.7 2056 95.8 2100 102 2143 108 2185 114 2226 120 2266 127 

36100 5766 2069 97.2 2111 104 2151 110 2192 116 2234 123 2275 129 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1400 100 100 103 106 100 98 98 92 82 104 

80 96 99 103 95 93 91 86 79 99 

60 95 95 99 92 90 89 86 83 96 

50 96 96 99 90 89 88 87 84 96 

40 100 100 101 92 90 89 87 85 97 

1911 100 110 107 115 108 104 106 103 93 112 

80 107 102 112 104 100 99 96 89 108 

60 107 98 108 99 97 96 94 91 104 

50 108 100 109 98 96 95 95 92 104 

40 110 105 110 100 97 96 95 93 106 

2302 100 114 113 117 115 109 110 108 100 117 

80 110 109 114 111 105 103 101 95 112 

60 110 106 110 107 102 101 99 96 109 

50 111 107 111 106 101 100 99 97 109 

40 113 111 113 108 102 100 100 98 110 

% WOV = (CFM x 100) / (RPM x 22.2) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1400 100 110 109 109 103 102 101 95 86 108 

80 106 106 105 100 99 96 91 83 104 

60 104 104 103 98 95 91 87 83 101 

50 104 102 101 96 93 90 87 84 99 

40 104 102 100 95 92 89 87 84 98 

1911 100 118 115 117 110 109 109 106 97 116 

80 113 112 114 107 106 104 101 93 112 

60 111 109 111 105 104 100 96 92 109 

50 112 109 109 103 102 98 95 92 107 

40 112 109 109 102 101 97 95 92 106 

2302 100 121 120 121 117 113 113 111 104 120 

80 116 116 117 114 111 109 106 99 117 

60 114 114 115 111 108 105 101 97 114 

50 115 114 113 110 106 103 100 97 112 

40 115 114 113 109 105 102 99 97 111 



1911 

GREENHECK 

® 

17

36 BISW 








III 1727 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


21700 2832 1435 47.0 1493 52.0 1551 57.2 1607 62.6 1661 68.1 1713 73.7 1763 79.3 

23700 3093 1462 51.3 1517 56.3 1569 61.5 1622 66.9 1676 72.6 1728 78.5 1778 84.4 1826 90.4 1874 96.5 

25700 3355 1489 55.8 1544 61.1 1596 66.6 1646 72.1 1695 77.7 1741 83.3 1793 89.6 1841 95.8 1888 102 1978 115 

27700 3616 1519 60.6 1572 66.2 1624 71.9 1674 77.7 1722 83.6 1768 89.5 1813 95.5 1857 102 1903 108 1993 122 

29700 3877 1557 66.1 1604 71.8 1651 77.6 1701 83.7 1749 89.8 1795 96.0 1840 102 1883 109 1925 115 2006 128 

31700 4138 1594 72.0 1642 78.0 1688 84.0 1731 90.0 1777 96.3 1823 103 1867 109 1910 116 1952 123 2033 136 

33700 4399 1635 78.3 1680 84.5 1725 90.8 1769 97.2 1810 104 1851 110 1895 117 1938 124 1980 131 2060 145 

35700 4660 1677 85.1 1721 91.5 1763 98.1 1806 105 1848 111 1888 118 1927 125 1965 132 2007 139 

37700 4921 1720 92.3 1763 99.1 1805 106 1845 113 1886 120 1926 127 1965 134 2002 141 2039 148 

39700 5182 1764 100 1806 107 1847 114 1887 121 1926 128 1963 136 2002 143 2040 150 

41700 5443 1811 108 1850 116 1890 123 1929 130 1968 138 2005 145 2041 153 

43700 5704 1860 117 1898 124 1934 132 1972 140 2010 148 2047 155 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1200 100 102 108 104 97 95 94 87 81 102 

80 97 106 100 93 91 88 83 78 98 

60 95 103 97 89 88 86 83 81 95 

50 97 103 97 88 87 85 84 81 95 

40 106 107 101 92 89 86 85 82 97 

1727 100 109 115 119 108 103 102 99 92 113 

80 103 111 117 104 99 98 94 88 110 

60 101 108 113 101 96 95 93 90 107 

50 103 109 114 100 95 94 92 91 107 

40 112 116 117 104 98 95 93 91 110 

2082 100 112 118 122 116 109 107 104 98 118 

80 107 114 119 112 105 102 99 94 114 

60 104 111 116 108 101 99 97 95 111 

50 106 113 117 108 101 98 97 95 111 

40 115 120 121 112 103 100 98 96 115 

% WOV = (CFM x 100) / (RPM x 30.1) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1200 100 111 112 107 102 99 97 92 85 106 

80 108 109 103 98 94 91 86 80 101 

60 102 107 101 95 91 88 84 80 99 

50 103 106 100 94 90 87 84 80 98 

40 104 105 99 93 89 85 83 80 97 

1727 100 117 120 121 112 108 106 103 97 116 

80 114 116 118 108 104 101 97 91 113 

60 109 112 117 105 101 97 94 90 110 

50 110 113 115 104 100 96 93 90 109 

40 111 113 114 103 99 95 92 90 108 

2082 100 120 123 125 119 113 110 108 102 121 

80 117 120 122 115 109 106 102 97 117 

60 112 115 120 112 106 102 99 95 115 

50 113 116 119 111 105 101 98 95 114 

40 114 116 118 111 104 100 97 95 113 



18 

1727 

GREENHECK 

®

40 BISW 








III 1538 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


31100 3340 1327 63.8 1371 69.4 1412 75.1 1453 80.8 1492 86.6 1537 93.1 1581 99.9 1624 107 1665 114 

33100 3555 1355 69.1 1398 74.9 1440 80.9 1479 86.8 1518 92.9 1555 99.0 1591 105 1635 112 1676 119 1755 134 

35100 3770 1386 74.8 1426 80.8 1466 86.9 1506 93.2 1544 99.5 1581 106 1617 112 1652 119 1686 125 1766 140 

37100 3984 1417 80.8 1457 87.1 1495 93.4 1533 99.9 1571 106 1608 113 1643 120 1678 126 1712 133 1777 147 

39100 4199 1449 87.2 1488 93.8 1526 100 1563 107 1598 114 1635 121 1670 128 1704 135 1738 142 1802 156 

41100 4414 1482 93.8 1520 101 1558 108 1594 115 1629 122 1663 129 1697 136 1731 143 1765 150 1828 165 

43100 4629 1515 101 1553 108 1589 115 1625 123 1660 130 1694 137 1726 144 1758 152 1791 159 

45100 4844 1551 108 1586 116 1622 123 1657 131 1691 139 1725 146 1757 154 1789 161 1820 169 

47100 5059 1587 116 1622 124 1655 132 1690 140 1724 148 1756 156 1788 163 1820 171 

49100 5273 1624 124 1658 132 1691 140 1723 149 1756 157 1789 165 1820 173 

51100 5488 1665 133 1695 141 1727 149 1759 158 1789 167 1821 175 

53100 5703 1707 143 1735 151 1764 159 1795 168 1825 177 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1100 100 104 110 104 97 96 95 88 81 102 

80 99 108 99 93 92 89 83 79 98 

60 97 105 96 90 89 87 84 81 96 

50 99 105 96 89 88 86 85 82 95 

40 108 108 100 92 89 87 85 83 98 

1538 100 110 116 118 108 104 102 98 92 113 

80 105 112 115 103 100 98 93 88 109 

60 102 109 112 100 96 95 93 90 106 

50 104 111 112 100 95 94 93 91 106 

40 113 117 115 103 98 95 93 91 109 

1852 100 113 119 121 115 109 107 103 97 117 

80 108 115 119 111 105 102 98 94 114 

60 106 112 115 107 101 99 97 95 111 

50 108 114 116 107 101 99 97 95 111 

40 117 121 120 111 103 100 98 96 114 

% WOV = (CFM x 100) / (RPM x 38.0) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1100 100 112 114 106 103 99 98 93 85 106 

80 109 110 102 99 95 92 86 81 102 

60 104 109 100 96 92 89 85 81 99 

50 105 108 99 95 90 87 85 81 98 

40 106 107 98 94 89 86 84 81 97 

1538 100 118 120 120 112 108 106 102 96 116 

80 115 117 117 108 104 101 96 91 112 

60 110 114 115 105 101 97 94 90 110 

50 111 114 114 104 100 96 93 90 109 

40 112 114 113 103 99 95 92 90 108 

1852 100 121 124 124 118 113 111 107 102 121 

80 118 121 121 114 109 106 102 96 117 

60 113 117 119 112 106 102 99 95 114 

50 114 117 118 111 105 101 98 95 113 

40 115 117 117 110 104 100 97 95 112 



GREENHECK 

® 

19

44 BISW 










III 1392 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


37700 3309 1198 77.3 1236 84.1 1274 90.9 1311 97.9 1346 105 1389 113 1429 121 1468 130 1505 138 

39900 3503 1219 82.9 1259 90.0 1297 97.2 1332 105 1367 112 1401 119 1438 127 1477 136 1514 144 1586 162 

42100 3696 1244 89.1 1281 96.3 1318 104 1355 111 1389 119 1422 127 1455 134 1487 142 1523 151 1595 169 

44300 3889 1270 95.6 1306 103 1341 111 1376 119 1411 126 1444 134 1476 142 1508 150 1538 159 1603 176 

46500 4082 1295 102 1331 110 1366 118 1399 126 1433 134 1466 142 1497 151 1529 159 1559 168 1618 184 

48700 4275 1322 110 1357 118 1391 126 1424 134 1456 143 1488 151 1520 160 1551 168 1580 177 1639 194 

50900 4468 1348 117 1383 126 1417 134 1449 143 1481 151 1512 160 1542 169 1573 178 1603 187 

53100 4661 1376 125 1410 134 1443 143 1475 152 1507 161 1537 169 1567 178 1595 188 1624 197 

55300 4855 1405 133 1437 142 1470 152 1501 161 1532 170 1562 179 1592 189 1620 198 1648 207 

57500 5048 1435 141 1466 151 1496 161 1528 170 1558 180 1588 190 1617 199 1645 209 

59700 5241 1465 150 1496 160 1525 170 1555 180 1585 190 1614 200 1643 210 

61900 5434 1498 160 1525 170 1555 180 1584 191 1612 201 1641 211 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

1000 100 106 111 104 98 96 95 88 82 103 

80 101 109 99 94 92 89 83 79 99 

60 99 106 96 90 90 87 85 82 96 

50 101 107 96 89 89 87 85 83 96 

40 109 109 100 92 90 88 86 83 99 

1392 100 112 117 117 108 104 103 98 92 112 

80 107 114 114 103 100 98 93 88 109 

60 104 111 110 100 97 96 93 90 106 

50 106 112 111 99 96 95 93 91 106 

40 115 117 114 103 98 96 94 92 109 

1675 100 115 121 120 114 109 107 104 97 117 

80 110 117 117 110 105 103 99 94 113 

60 107 114 114 107 102 100 98 95 110 

50 110 116 114 106 101 99 98 96 110 

40 118 121 117 110 103 101 99 96 113 

% WOV = (CFM x 100) / (RPM x 51.4) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

1000 100 113 115 107 103 100 98 92 85 107 

80 110 112 102 99 96 92 87 81 102 

60 105 110 100 96 92 89 85 81 100 

50 106 109 99 95 91 88 85 82 99 

40 107 108 98 94 90 87 85 82 98 

1392 100 119 121 119 112 109 107 102 96 116 

80 116 118 115 108 104 101 96 91 112 

60 111 115 114 105 101 98 94 90 109 

50 112 115 113 104 100 96 94 90 108 

40 113 115 112 103 99 95 93 90 107 

1675 100 123 125 123 118 114 111 108 102 121 

80 119 122 119 114 109 106 102 96 116 

60 114 118 117 111 106 103 99 95 114 

50 115 118 116 111 105 101 98 95 113 

40 116 118 115 110 104 100 98 95 112 



20 

1392 

GREENHECK 

®

49 BISW 










III 1264 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


45000 3260 1083 91.9 1118 100 1153 108 1186 117 1222 126 1260 135 1296 145 1331 155 

48000 3478 1105 99.6 1141 108 1174 117 1207 126 1239 134 1270 143 1305 153 1340 163 1374 174 

51000 3695 1130 108 1163 117 1197 126 1230 135 1261 144 1292 153 1321 163 1350 172 1383 183 1448 205 

54000 3913 1156 117 1189 126 1220 135 1252 145 1284 154 1313 164 1343 174 1371 184 1399 193 1457 214 

57000 4130 1182 126 1215 136 1246 145 1276 155 1306 165 1336 175 1366 185 1393 195 1421 206 1474 226 

60000 4347 1209 136 1241 146 1272 156 1302 166 1331 177 1359 187 1387 197 1416 208 1442 219 1495 240 

63000 4565 1236 146 1268 157 1298 168 1328 178 1356 189 1384 200 1411 210 1438 221 1465 232 

66000 4782 1266 157 1295 168 1325 179 1354 191 1382 202 1410 213 1437 224 1463 235 1488 246 

69000 5000 1296 168 1324 180 1353 192 1381 203 1409 215 1436 227 1463 238 1488 250 

72000 5217 1326 180 1354 193 1382 205 1409 217 1436 229 1463 241 1489 253 

75000 5434 1360 194 1385 206 1412 218 1438 231 1463 244 1490 256 

78000 5652 1394 208 1417 220 1442 232 1468 245 1493 259 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

900 100 108 113 103 98 97 94 87 81 103 

80 104 111 99 94 93 89 83 79 100 

60 101 107 96 91 90 88 85 82 97 

50 102 108 95 90 89 87 85 83 97 

40 110 111 99 93 90 88 86 83 99 

1264 100 114 119 116 108 105 104 98 92 112 

80 109 116 112 103 101 99 93 89 108 

60 106 113 109 100 98 96 94 91 106 

50 108 114 109 99 97 95 94 91 105 

40 117 118 112 102 99 96 95 92 108 

1521 100 117 122 119 114 110 108 104 97 117 

80 112 119 115 110 106 103 99 94 113 

60 109 116 112 106 102 101 98 96 110 

50 111 117 112 106 102 100 98 96 110 

40 120 122 116 109 104 101 99 97 113 

% WOV = (CFM x 100) / (RPM x 68.6) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

900 100 114 116 107 104 100 98 92 85 107 

80 111 113 103 99 96 92 86 81 103 

60 107 111 100 96 92 89 85 81 100 

50 107 110 99 95 91 88 85 82 99 

40 108 109 98 94 90 87 85 82 98 

1264 100 121 122 118 113 109 107 103 96 116 

80 118 119 114 108 105 102 96 91 112 

60 112 117 112 105 101 98 94 91 109 

50 113 116 111 104 100 97 94 91 108 

40 114 115 110 104 99 96 94 91 107 

1521 100 124 126 121 118 114 112 108 102 121 

80 121 123 117 114 110 107 102 96 116 

60 115 120 115 111 106 103 99 96 113 

50 116 119 114 110 105 102 99 96 113 

40 117 119 113 109 104 101 98 96 112 



1264 

GREENHECK 

® 

21

54 BISW 










III 1142 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


56300 3327 984 116 1017 126 1047 136 1077 146 1106 157 1141 169 1173 181 1205 194 1236 206 

59800 3534 1004 125 1036 135 1067 146 1096 157 1125 168 1152 179 1179 190 1213 203 1243 216 1302 242 

63300 3741 1026 135 1056 145 1086 157 1116 168 1143 179 1171 191 1198 202 1224 214 1251 226 1310 253 

66800 3947 1048 145 1078 156 1106 168 1135 180 1163 191 1190 203 1216 215 1242 227 1267 240 1316 264 

70300 4154 1071 156 1100 168 1128 180 1155 192 1182 204 1209 216 1236 229 1261 241 1286 254 1334 280 

73800 4361 1094 168 1123 180 1151 193 1178 205 1204 218 1229 230 1255 243 1280 256 1304 269 1352 296 

77300 4568 1118 180 1146 193 1173 206 1200 219 1226 232 1251 245 1275 258 1299 271 1324 285 

80800 4775 1143 192 1170 206 1197 220 1223 233 1248 247 1273 260 1297 274 1321 288 1344 302 

84300 4982 1169 205 1195 220 1220 234 1246 248 1271 263 1296 277 1319 291 1343 305 

87800 5189 1195 219 1220 234 1245 249 1270 264 1294 279 1318 293 1342 308 

91300 5395 1223 235 1247 249 1271 265 1294 280 1318 296 1342 311 

94800 5602 1252 251 1274 265 1297 281 1320 297 1343 313 




22 



RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

800 100 109 113 103 99 97 94 87 81 103 

80 106 111 99 95 93 89 83 79 100 

60 103 107 95 91 90 88 85 82 97 

50 104 108 95 90 89 88 86 83 97 

40 110 111 98 93 90 88 86 83 99 

1142 100 116 120 115 108 106 105 98 92 113 

80 111 118 110 103 102 99 93 89 109 

60 108 115 107 100 99 97 94 91 106 

50 110 115 107 99 98 96 95 92 106 

40 119 119 111 102 99 97 95 93 108 

1375 100 119 124 122 113 110 109 104 97 118 

80 114 121 119 109 106 104 99 94 114 

60 111 118 116 106 103 101 99 96 111 

50 114 119 116 105 102 101 99 97 111 

40 122 123 120 109 104 102 100 97 115 

% WOV = (CFM x 100) / (RPM x 93.0) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

800 100 115 116 107 103 101 98 91 84 107 

80 112 113 103 99 96 92 86 80 103 

60 108 111 100 96 92 89 85 81 100 

50 108 110 99 95 91 88 85 82 99 

40 108 109 98 94 90 87 85 82 98 

1142 100 122 123 117 113 109 108 103 95 116 

80 119 120 113 109 105 102 97 91 112 

60 113 119 110 106 102 99 95 91 109 

50 114 117 110 105 100 97 95 91 108 

40 116 116 109 104 99 96 94 91 107 

1375 100 125 127 125 118 114 112 108 101 122 

80 122 124 121 114 110 107 102 96 117 

60 117 121 119 111 107 103 100 96 115 

50 118 121 118 110 105 102 99 96 114 

40 119 120 117 109 105 101 99 96 113 



1142 

GREENHECK 

®

60 BISW 










III 1032 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


72100 3483 903 150 932 163 960 176 987 189 1013 202 1038 215 1066 230 1095 246 1123 261 

76500 3695 923 162 950 175 978 189 1005 202 1030 216 1055 230 1079 244 1103 258 1130 274 1183 307 

80900 3908 944 175 971 189 997 203 1023 217 1048 231 1072 246 1096 260 1120 275 1143 290 1190 321 

85300 4120 965 189 991 203 1017 218 1042 232 1066 247 1091 262 1115 277 1137 293 1160 308 1203 339 

89700 4333 986 203 1012 218 1038 233 1062 249 1086 264 1109 279 1132 295 1156 311 1177 327 1220 359 

94100 4545 1008 218 1034 234 1059 250 1083 266 1106 282 1129 298 1151 314 1173 330 1196 347 

98500 4758 1031 234 1056 251 1080 267 1104 284 1127 301 1150 317 1172 334 1193 350 1213 367 

102900 4971 1056 250 1079 268 1102 286 1126 303 1148 320 1170 337 1192 355 1213 372 

107300 5183 1080 268 1103 286 1125 304 1147 322 1170 340 1192 359 1213 377 

111700 5396 1106 287 1127 305 1149 324 1170 343 1192 362 1213 380 

116100 5608 1133 308 1153 325 1173 344 1194 364 1215 384 

120500 5821 1161 330 1180 348 1198 366 1218 386 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

750 100 112 113 104 100 99 95 88 82 104 

80 108 111 100 96 94 90 85 80 100 

60 105 108 96 93 91 89 86 83 98 

50 107 108 96 92 91 89 87 84 98 

40 112 111 99 94 92 90 88 85 100 

1032 100 117 122 114 108 106 105 98 92 113 

80 113 120 110 104 102 99 93 89 109 

60 110 116 106 100 99 97 95 92 106 

50 112 117 106 99 99 97 95 92 106 

40 120 120 110 102 100 98 96 93 109 

1243 100 121 125 122 114 111 109 104 97 118 

80 116 122 118 109 107 104 99 94 114 

60 113 119 115 106 104 102 99 97 111 

50 115 120 115 105 103 101 100 97 111 

40 123 124 118 108 105 102 100 98 114 

% WOV = (CFM x 100) / (RPM x 126) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

750 100 117 117 108 105 102 99 92 85 108 

80 114 113 104 101 97 93 87 81 104 

60 110 111 101 97 94 90 86 83 101 

50 110 110 100 96 92 90 86 83 100 

40 110 109 99 95 91 89 86 83 99 

1032 100 123 125 117 113 110 108 103 95 117 

80 120 121 112 109 105 102 97 91 112 

60 115 120 110 106 102 99 95 91 110 

50 116 119 109 105 101 98 95 92 109 

40 117 118 108 104 100 97 95 92 108 

1243 100 126 128 124 118 115 113 108 101 122 

80 123 125 120 114 110 107 102 96 118 

60 118 123 118 111 107 104 100 96 115 

50 119 122 117 110 106 103 100 97 114 

40 120 121 116 109 105 101 99 96 113 



GREENHECK 

® 

23

66 BISW 










III 939 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


86900 3469 820 180 847 196 871 212 896 227 920 243 943 259 969 277 995 296 1020 315 

91800 3664 837 194 862 210 887 226 912 243 934 259 957 276 979 293 1001 310 1026 329 1075 369 

96700 3860 854 208 878 225 902 241 926 259 950 276 972 293 993 311 1015 328 1036 346 1081 385 

101600 4055 871 223 896 241 919 258 942 275 965 293 987 311 1008 329 1029 348 1050 366 1089 403 

106500 4251 889 239 913 257 936 275 959 293 980 312 1002 330 1024 349 1045 368 1064 387 1104 425 

111400 4447 908 256 931 274 954 293 976 312 997 331 1018 350 1038 369 1059 389 1080 408 1118 448 

116300 4642 926 273 949 292 972 312 993 332 1015 351 1035 371 1055 391 1075 411 1095 431 

121200 4838 946 291 967 311 990 332 1011 352 1032 373 1052 393 1072 413 1092 434 1110 455 

126100 5033 966 309 987 331 1008 352 1029 373 1050 395 1070 416 1090 437 1109 458 

131000 5229 987 329 1008 351 1028 373 1048 396 1068 418 1088 440 1107 462 

135900 5425 1009 351 1028 373 1048 395 1067 418 1086 441 1106 464 

140800 5620 1032 374 1049 396 1068 418 1087 442 1106 466 




24 



RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

700 100 114 114 105 101 100 95 89 83 105 

80 111 111 100 97 95 90 86 81 101 

60 107 107 97 94 93 90 87 85 99 

50 109 108 96 93 92 90 88 85 99 

40 113 111 100 95 93 91 89 86 101 

939 100 119 123 114 108 107 105 98 92 113 

80 115 121 110 104 103 99 94 89 110 

60 112 118 106 101 100 98 95 92 107 

50 114 118 106 100 99 97 96 93 107 

40 121 121 110 103 100 98 96 93 109 

1130 100 122 126 121 114 111 109 104 97 118 

80 118 124 118 110 107 104 99 95 115 

60 115 121 114 106 104 102 100 97 112 

50 117 121 114 106 103 102 100 98 112 

40 124 125 118 109 105 103 101 98 115 

% WOV = (CFM x 100) / (RPM x 168) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

700 100 118 117 109 106 104 100 93 86 109 

80 115 113 105 102 98 94 88 82 105 

60 112 111 102 98 95 91 87 84 102 

50 112 110 101 97 93 91 88 84 101 

40 112 109 100 96 92 90 87 84 100 

939 100 124 126 117 114 111 108 102 95 117 

80 121 123 113 110 106 102 97 91 113 

60 117 121 110 106 102 99 95 92 110 

50 117 120 109 105 101 98 95 92 109 

40 118 119 109 104 100 97 95 92 108 

1130 100 127 130 124 119 115 113 108 101 122 

80 124 126 120 114 111 107 102 96 118 

60 120 124 118 111 107 104 100 97 115 

50 120 123 117 110 106 103 100 97 114 

40 121 123 116 109 105 102 100 97 113 



939 

GREENHECK 

®

73 BISW 










III 848 



CFM OV 10 11 12 13 14 15 16 17 18 

20 


99700 3253 727 204 750 222 774 240 796 259 821 279 846 301 870 323 894 345 

106200 3466 741 220 766 239 788 259 810 278 832 298 852 317 876 339 900 362 923 386 

112700 3678 758 238 780 258 803 278 825 298 846 319 866 339 886 360 906 381 929 404 

119200 3890 775 258 797 278 818 298 840 319 861 341 880 362 900 384 920 405 938 427 

125700 4102 792 278 814 299 835 320 855 342 875 364 896 386 916 409 934 431 952 454 

132200 4314 809 299 831 322 852 344 872 366 891 389 910 411 930 435 949 458 967 482 

138700 4526 827 321 849 345 869 368 889 392 908 415 927 439 945 462 963 486 982 511 

145200 4738 846 344 867 369 887 394 906 418 925 443 944 467 962 492 979 516 996 541 

151700 4951 866 369 885 395 905 420 924 446 943 472 961 497 979 522 996 548 

158200 5163 886 394 905 421 923 448 942 475 960 501 978 528 996 555 1013 581 

164700 5375 907 422 925 449 943 477 960 505 978 533 996 560 1013 588 

171200 5587 930 453 945 479 963 507 980 536 997 565 






RPM % WOV 1 2 3 4 5 6 7 8 LwiA 

600 100 114 110 103 101 100 93 87 81 104 

80 112 106 99 97 94 89 84 80 100 

60 109 103 95 94 92 89 87 84 98 

50 109 103 94 93 91 90 87 84 97 

40 113 107 98 95 92 91 88 85 99 

848 100 120 124 114 109 108 104 98 92 114 

80 117 122 110 105 103 99 94 90 111 

60 114 119 106 102 100 98 95 93 108 

50 115 120 106 101 100 98 96 93 108 

40 122 122 109 103 101 99 97 94 110 

1022 100 124 128 121 114 112 109 104 97 119 

80 120 125 117 110 108 104 99 95 115 

60 117 122 114 107 105 103 100 97 112 

50 118 123 114 106 104 103 101 98 112 

40 125 127 117 109 106 103 101 99 115 

972 453 

978 474 

988 500 

1002 529 

% WOV = (CFM x 100) / (RPM x 227) 


RPM % WOV 1 2 3 4 5 6 7 8 LwoA 

600 100 118 113 108 105 103 98 91 84 108 

80 115 109 104 101 97 92 86 81 103 

60 113 107 101 97 94 90 86 82 100 

50 112 106 100 96 93 90 86 83 99 

40 111 105 99 95 91 89 86 83 98 

848 100 125 127 117 114 111 108 102 95 118 

80 122 124 113 110 106 102 97 91 113 

60 118 123 111 107 103 100 96 92 111 

50 118 121 110 105 101 99 96 92 110 

40 119 120 109 104 100 98 96 92 109 

1022 100 128 131 124 119 116 113 108 101 123 

80 125 128 120 115 111 107 102 97 118 

60 121 125 118 112 108 105 101 97 116 

50 121 125 117 111 107 104 101 97 115 

40 122 124 116 110 105 103 100 97 114 



GREENHECK 

® 

25

30 BISWD 

26 

Direct Drive Fan Quick Selection 

Direct drive centrifugal fan wheel widths are available 

from 50% to 100% in 5% increments. Multiple fans sizes 

may be available to meet a specific performance 

requirement. The following charts allow for quick 

selection of fan size and RPM for specified operating 

points. The charts shown are for 60 Hertz motor RPMs - 

870, 1170, 1770. 



III 2102 


Wheel Diameter 30 in. 


GREENHECK 

®

33 BISWD 

36 BISWD 



III 1911 









GREENHECK 

® 

27

40 BISWD 

44 BISWD 

28 






III 1392 






GREENHECK 

®

49 BISWD 

54 BISWD 



III 1264 









GREENHECK 

® 

29

60 BISWD 

60 BISWD 

30 











GREENHECK 

®

66 BISWD 

73 BISWD 



III 939 









GREENHECK 

® 

31

30 BISWD 

32 

Direct Drive Sound Data Sound Power [dB Ref 10 -12 watts] 



1770 2 102 102 108 102 98 98 94 86 106 1770 2 111 110 111 105 103 102 98 90 109 

4 101 100 107 100 97 96 92 85 104 4 109 108 109 104 102 100 96 89 108 

6 100 99 106 98 95 93 90 84 102 6 108 107 108 102 101 98 94 87 107 

8 99 97 103 96 93 92 89 85 100 8 107 106 107 101 99 96 92 87 105 

10 100 96 102 94 91 91 89 87 99 10 106 104 104 99 96 93 90 87 102 

33 BISWD 



1770 4 106 103 111 103 100 100 96 88 108 1770 4 113 112 113 107 106 104 100 92 112 

6 104 102 110 102 98 98 94 87 106 6 112 111 112 106 105 103 99 91 110 

8 104 100 109 100 97 96 93 87 105 8 111 110 111 105 103 101 97 90 109 

10 104 99 107 98 96 95 92 88 103 10 110 108 110 104 102 99 95 90 108 

12 104 98 106 96 94 94 92 90 102 12 109 107 107 102 100 96 93 90 106 

36 BISWD 



1770 8 104 111 117 105 100 98 95 89 111 1770 8 114 117 119 109 105 102 98 92 114 

10 103 110 116 104 99 97 94 89 110 10 113 116 118 108 104 100 97 91 113 

12 102 109 115 103 98 96 94 90 109 12 111 114 117 107 103 99 95 91 112 

14 102 109 114 101 96 95 93 91 108 14 109 113 117 106 101 98 94 91 111 

16 112 117 117 105 98 96 94 92 111 16 111 113 115 104 99 95 93 90 109 

40 BISWD 



1770 12 107 114 118 109 103 101 97 92 112 1770 12 117 119 119 112 107 104 100 95 115 

14 106 114 117 108 102 100 97 93 112 14 115 118 119 111 107 103 99 94 115 

16 106 113 116 106 101 99 96 93 111 16 114 117 118 111 106 102 98 94 114 

18 105 112 114 105 100 98 96 93 110 18 112 116 118 110 104 101 97 94 113 

20 108 114 115 105 99 98 96 94 110 20 113 116 117 109 103 99 97 94 112 

44 BISWD 



1170 2 107 113 108 101 99 97 91 85 106 1170 2 115 117 111 106 102 100 95 88 110 

4 106 112 107 100 97 95 89 84 105 4 114 116 110 105 101 98 93 87 108 

6 104 112 106 98 96 93 88 83 103 6 113 115 108 103 99 96 91 85 107 

8 102 110 104 96 94 92 88 84 102 8 110 113 107 101 98 94 90 85 105 

10 102 109 102 94 93 91 88 86 100 10 108 112 106 100 96 92 89 85 104 

The sound power level ratings shown are in decibels, referred to 10 -12 watts calculated per AMCA Standard 301. Values shown are for inlet Lwi, 

LwiA and outlet Lwo, LwoA sound power levels for full (100%) width wheels, installation Type B: free inlet, ducted outlet. Outlet ratings include 

the effects of duct end correction.

Direct Drive Sound Data Sound Power [dB Ref 10 -12 watts] 

49 BISWD 



1170 4 110 116 111 103 101 99 93 88 108 1170 4 117 119 113 108 105 102 97 90 112 

6 108 115 109 102 100 97 92 87 107 6 116 118 112 107 103 100 95 89 110 

8 107 114 108 101 98 96 91 86 106 8 115 117 111 106 102 99 94 88 109 

10 106 113 107 99 97 95 91 88 105 10 113 116 110 104 100 97 93 88 108 

12 105 112 105 97 96 94 91 89 103 12 111 115 109 103 99 95 92 88 107 

54 BISWD 



1170 6 113 119 113 106 104 102 96 91 111 1170 6 120 122 115 111 107 105 99 93 114 

8 112 119 112 105 103 100 94 90 110 8 120 121 114 110 106 103 98 92 113 

10 111 118 111 103 102 99 94 90 109 10 118 120 113 109 105 102 97 91 112 

12 110 117 110 102 101 98 94 91 108 12 116 120 112 108 104 101 96 91 111 

14 109 115 108 101 99 97 95 92 107 14 114 119 111 107 102 99 95 91 110 

60 BISWD 



870 2 113 116 107 102 101 97 91 85 107 870 2 119 119 110 107 104 101 95 88 111 

4 112 115 106 101 99 96 90 85 106 4 118 118 109 106 103 99 93 87 109 

6 110 115 104 99 97 94 88 84 104 6 116 117 107 104 101 97 91 85 108 

8 109 113 102 98 96 93 89 85 103 8 114 116 106 103 99 95 91 86 106 

10 108 111 100 96 95 92 90 87 102 10 112 115 105 101 97 94 90 86 105 



1170 10 115 122 116 108 105 103 97 93 113 1170 10 122 124 118 113 109 106 101 95 116 

12 114 121 115 107 105 102 97 93 112 12 121 123 117 112 108 105 100 94 116 

14 114 120 114 106 104 102 97 93 111 14 120 123 116 111 107 104 99 94 115 

16 113 119 113 105 103 101 98 94 111 16 118 122 116 110 106 103 99 95 114 

18 112 118 112 104 102 100 98 95 110 18 117 121 115 109 105 102 98 95 113 

66 BISWD 



870 4 115 119 109 104 103 99 93 88 109 870 4 121 122 113 109 106 103 97 90 113 

6 114 118 108 103 101 98 92 87 108 6 120 121 111 108 105 101 95 89 112 

8 113 118 107 102 100 97 91 87 107 8 119 120 110 107 103 99 94 88 110 

10 112 116 105 100 99 96 92 89 106 10 117 119 109 105 102 98 93 89 109 

12 111 115 103 99 98 95 93 90 105 12 115 118 108 104 100 97 93 89 108 

73 BISWD 



870 6 118 124 112 107 105 102 96 91 113 870 6 124 126 116 112 109 105 99 93 116 

8 117 123 111 106 104 101 95 90 112 8 123 125 115 111 108 104 98 92 115 

10 116 122 110 105 103 100 95 91 111 10 122 124 114 110 106 102 97 92 114 

12 115 121 109 104 102 99 95 92 110 12 120 124 113 109 105 101 97 92 113 

14 114 120 107 103 101 99 96 93 109 14 119 123 112 107 104 100 96 92 112 

The sound power level ratings shown are in decibels, referred to 10 -12 watts calculated per AMCA Standard 301. Values shown are for inlet Lwi, 

LwiA and outlet Lwo, LwoA sound power levels for full (100%) width wheels, installation Type B: free inlet, ducted outlet. Outlet ratings include 

the effects of duct end correction. 

33

Dimensional Data 

Data shown on these pages is for general information only and should not be used for exact installation dimensions. Columns A, B and C 

have been rounded up to the nearest 1". All other columns are rounded to the nearest 1/8". For detailed dimensional data or dimensions 

involving partial width wheels consult factory. All dimensional drawings represent clockwise rotation. Counterclockwise would be a mirror 

image and would not affect overall dimensions. Rotation is determined from the drive side of the unit. 

34 

A 

Sizes 18-73 

Arrangement 1 

Size Class 

18 IV 















B 

A B 

TH BH UB DB TAU BAU 

D 

A 

B 

D 

TH 

BH 

A 

UB 

DB 

B 

TAU BAU 

Due to Greenheck’s policy of continuous product improvement, dimensions are subject to change. 

For complete dimensional information refer to the applicable Greenheck submittal drawing. 

A 

D 

B C 

Clockwise Top Horizontal (TH) discharge shown above 

D 

A 

C 

TH 

B 

BH 

BAU 

D 

UB 

TAU 

D 

DB 

F G J 

37 39 34 33 43 37 33 36 32 42 42 15 1 /2 24 18 15 7 /8 19 3 /8 14 5 /8 19 1 /4 

40 42 37 36 47 41 36 39 34 46 45 16 1 /2 26 19 1 /2 17 21 1 /4 16 21 1 /8 

44 46 40 39 52 44 39 43 38 50 50 18 1 /2 28 21 1 /2 18 3 /8 23 5 /8 17 3 /4 23 

48 50 44 43 57 48 43 47 42 55 53 20 30 24 19 7 /8 26 19 1 /2 25 7 /8 

53 54 48 47 62 53 47 52 46 60 57 22 33 26 21 3 /8 28 5 /8 21 1 /2 28 1 /2 

58 60 53 51 68 58 51 57 51 66 63 24 1 /2 36 29 23 3 /8 31 7 /8 23 7 /8 31 3 /4 

65 66 58 56 75 64 56 63 56 72 70 27 1 /2 40 32 25 1 /4 35 26 1 /4 34 7 /8 

71 73 63 61 82 70 61 69 62 79 75 30 1 /2 44 35 1 /2 27 1 /2 38 3 /4 29 38 1 /2 

78 80 69 67 90 77 67 76 69 87 80 33 1 /2 48 39 29 7 /8 42 5 /8 31 7 /8 42 

86 89 76 74 99 86 74 84 76 96 88 36 1 /2 53 1 /2 42 1 /2 32 5 /8 47 1 /8 35 1 /4 46 1 /2 

94 97 83 81 109 93 81 92 83 105 95 40 58 47 35 3 /8 51 3 /4 38 3 /4 51 

104 106 91 89 120 102 89 102 92 116 101 44 63 1 /2 52 38 3 /4 57 3 /8 42 7 /8 56 1 /2 

114 119 100 98 132 115 98 112 102 127 111 48 1 /2 72 57 42 3 /8 63 1 /2 47 1 /2 62 1 /2 

126 130 109 107 144 125 107 124 112 140 117 53 78 62 46 1 /4 69 3 /4 52 1 /8 69 

139 143 120 118 159 138 118 137 124 154 123 59 85 1 /2 69 50 3 /4 77 1 /4 57 5 /8 76 

BH UB DB TAU BAU 

G 

F 

J 

A 

B 

GREENHECK 

® 

D

Sizes 30-49 

Arrangement 4 

Size 

Sizes 30-73 

Arrangement 8 

A 

B C* 

A 

A B 

TH BH UB DB TAU BAU TH 

C* 

BH 

UB 

DB 

TAU BAU 

284T 

286T 324T 

326T 364T 

365T 404T 

405T 444T 

445T 

30 58 60 

33 65 66 

36 71 73 

40 78 80 

44 86 89 

49 94 97 

Size 

30 58 60 

33 65 66 

36 71 73 

40 78 80 

44 86 89 

49 94 97 

54 104 106 

60 114 119 

66 126 130 

73 139 143 

B 

D 

A 

B 

D 

A 

G 

F 

B C* 

D 

A 

D 

B 

BH UB DB TAU BAU 

D 

A 

J 

* Dimension “C” is dependent upon 

motor frame size and wheel/scroll 

width. The Dim. “C” shown is 

calculated assuming 100% 

wheel/scroll width and TEFC 

motors. 

Dimension “G” shown is for 100% 

wheel/scroll width. 

B 

TH 

G 

D 

F 

BH 

BAU UB 

TAU 

A 

D 

J 

DB 

B 

F G J 

53 51 68 58 51 57 51 66 53 55 — — — 24 1 /2 36 29 23 3 /8 31 7 /8 23 7 /8 31 3 /4 

58 56 75 64 56 63 56 72 56 59 61 — — 27 1 /2 40 32 25 1 /4 35 26 1 /4 34 7 /8 

63 61 82 70 61 69 62 79 — 61 64 71 — 30 1 /2 44 35 1 /2 27 1 /2 38 3 /4 29 38 1 /2 

69 67 90 77 67 76 69 87 — — — 73 79 33 1 /2 48 39 29 7 /8 42 5 /8 31 7 /8 42 

76 74 99 86 74 84 76 96 — — 71 77 83 36 1 /2 53 1 /2 42 1 /2 32 5 /8 47 1 /8 35 1 /4 46 1 /2 

83 81 109 93 81 92 83 105 — — — 80 86 40 58 47 35 3 /8 51 3 /4 38 3 /4 51 

A B C* D 

TH BH UB DB TAU BAU 

TH UB 

TAU BAU 284T 324T 364T 404T 444T 447T BH UB 

BH DB 286T 326T 365T 405T 445T 449T TH BAU TAU 

F G J 

53 51 68 58 51 57 51 66 89 92 — — — — 24 1 /2 36 29 23 3 /8 31 7 /8 23 7 /8 31 3 /4 

58 56 75 64 56 63 56 72 95 98 101 — — — 27 1 /2 40 32 25 1 /4 35 26 1 /4 34 7 /8 

63 61 82 70 61 69 62 79 — 103 106 113 — — 30 1 /2 44 35 1 /2 27 1 /2 38 3 /4 29 38 1 /2 

69 67 90 77 67 76 69 87 — — — 117 125 — 33 1 /2 48 39 29 7 /8 42 5 /8 31 7 /8 42 

76 74 99 86 74 84 76 96 — — 117 125 132 — 36 1 /2 53 1 /2 42 1 /2 32 5 /8 47 1 /8 35 1 /4 46 1 /2 

83 81 109 93 81 92 83 105 — — — 131 138 — 40 58 47 35 3 /8 51 3 /4 38 3 /4 51 

91 89 120 102 89 102 92 116 — — — — 150 155 44 63 1 /2 52 38 3 /4 57 3 /8 42 7 /8 56 1 /2 

100 98 132 115 98 112 102 127 — — — — 159 164 48 1 /2 72 57 42 3 /8 63 1 /2 47 1 /2 62 1 /2 

109 107 144 125 107 124 112 140 — — — — 164 170 53 78 62 46 1 /4 69 3 /4 52 1 /8 69 

120 118 159 138 118 137 124 154 — — — — — 176 59 85 1 /2 69 50 3 /4 77 1 /4 57 5 /8 76 

Due to Greenheck’s policy of continuous product improvement, dimensions are subject to change. 

For complete dimensional information refer to the applicable Greenheck submittal drawing. 

DB 

GREENHECK 

® 

35 

D

The model number codes on this page are a complete guide to ordering or specifiing Greenheck Class IV centifugal fan models. 

Belt Drive (BISW) Model Number Code 


18 - 73 

Backward Inclined 

wheel, Single Width, 

belt drive 

Series 41 Construction 

36 - BISW - 41 - 1 - CW - TH - IV - A 500 

Arrangement 

1 

Rotation 

cw, ccw 

Direct Drive (BISWD) Model Number Code 


Arr. 4 30 - 49 

Arr. 8 30 - 73 

Backward Inclined 

wheel, Single Width, 

Direct drive 

Series 41 Construction 

36 - BISWD - 41 - 4 - CW - TH - IV - 80P - A 500 

Arrangement 

4, 8 

Rotation 

cw, ccw 

Fan Class 

IV 

GREENHECK 

P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410 

PH. 715-359-6171 

® 

Motor Horsepower 

400 = 40 750 = 75 

500 = 50 1000 = 100 

600 = 60 1250 = 125 

Motor RPM 

M = 3500 C = 870 

A = 1770 F = 690 

B = 1170 

Discharge Position 

TH = Top Horizontal TAU = Top Angular Up 

BH = Bottom Horizontal BAU = Bottom Angular Up 

UB = Up Blast TAD = Top Angular Down 

DB = Down Blast BAD = Bottom Angular Down 

Fan Class 

IV 

Discharge Position 

TH = Top Horizontal TAU = Top Angular Up 

BH = Bottom Horizontal BAU = Bottom Angular Up 

UB = Up Blast TAD = Top Angular Down 

DB = Down Blast BAD = Bottom Angular Down 

Motor Horsepower 

400 = 40 750 = 75 

500 = 50 1000 = 100 

600 = 60 1250 = 125 

Motor RPM 

A = 1770 C = 870 

B = 1170 

Percentage Wheel Width 

100 = 100% 70P = 70% 

90P = 90% 60P = 60% 

80P = 80% 50P = 50% 

Cent. Fan Class IV PM (Series 41) R 

July 1998

Centrifugal Fan Class IV - Greenheck Fan Corporation - Building ...

Create successful ePaper yourself

Delete template?

Save as template?