Selection Example and Warranty

Performance:

Volume - 0.5 m³/s

Pressure - 170 Pa Static Pressure

Power Frequency - 50 Hz

Results:

Following the constant static pressure line a size 31 with 160 hub and 4 blades needs:

15 degree blade pitch setting

2900 rpm motor

From the chart

The operating efficiency is between 55 and 57%

Using 2900 Motor rpm and Peak Absorbed Power Table

• 0.18 kW peak absorbed power

Sound power falls between 68 and 66 LwA for the color matched 1770 rpm. Using the Inlet Sound table and estimating 67 LwA with 2900 rpm, the calculated sound power and pressure are:

Sound Power of 80 LwA

Sound Pressure of 68.5 dBA

AX 31-160 4 Blades

 

 

Impeller Diameter = 12.25 inches (311 mm)

 

ft/min = cfm / 0.82

 

Outlet Velocity

Total

m/s = m³/s / 0.08

Pressure

ft/min = rpm X 3.20

Tip Speed

 

m/s = rpm X 0.98

 

65

68

67

 

 

67

 

66

68

68

 

 

67

 

69

Air density = 1.2 kg/m³

Volume

Air density = 0.075 lbs/ft³

 

 

 

 

 

 

 

 

 

 

 

Sound Power A-Weighted [LwA]

Peak Absorbed Power [Bhp/kW (60 Hz), kW (50 Hz)]

 

 

 

 

 

Sound Pressure [dBA]

 

 

 

 

 

Pitch Angle º

 

 

 

 

 

Inlet Sound

 

 

rpm

5

10

15

20

25

30

35

 

rpm

LwA

 

dBA

3500

(Bhp/kW)

0.19/0.14

0.30/0.22

0.43/0.32

0.56/0.42

0.71/0.53

0.88/0.66

1.07/0.80

 

3500

+20

 

+8.5

1770

(Bhp/kW)

0.03/0.02

0.04/0.03

0.06/0.04

0.07/0.05

0.09/0.07

0.11/0.09

0.14/0.10

 

1770

-

 

-11.5

2900

(kW)

0.08

0.13

0.18

0.24

0.30

0.37

0.45

 

2900

+13

 

+1.5

1450

(kW)

0.01

0.02

0.02

0.03

0.04

0.05

0.06

 

1450

-5

 

-16.5

Performance shown is for installation Type B: Free inlet, Ducted outlet. Performance ratings do not include the effects of appurtenances in the airstream. The AMCA Certified Ratings Seal applies to air performance ratings only.

Building Value in Air

Greenheck delivers value to mechanical engineers by helping them solve virtually any air quality challenges their clients face with a comprehensive selection of

top quality, innovative air- related equipment. We offer extra value to contractors by providing easy-to-install, competitively priced, reliable products that arrive on time.

And building owners and occupants value the energy efficiency, low maintenance and quiet dependable operation they experience long after the construction project ends.

Our Warranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the purchase date. Any units or parts which prove defective during the warranty period will be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the nearest authorized motor service station. Greenheck will not be responsible for any removal or installation costs.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.

Prepared to Support Green Building Efforts

Supplement AX July 2004 R Copyright © 2004 Greenheck Fan Corp.

P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck64 .com

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Greenheck Fan manual Selection Example and Warranty, AX 31-160 4 Blades

AX specifications

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