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Selection Example and Warranty
Performance:
Volume - 0.5 m ³ /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
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
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.
P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com
AX 31-160 4 Blades
Total
Pressure
68
68
Air density = 1.2 kg/m ³
Air density = 0.075 lbs/ft ³
Peak Absorbed Power [Bhp/kW (60 Hz), kW (50 Hz)]
Pitch Angle º
rpm
5
10
15
20
3500 (Bhp/kW)
0.19/0.14
0.30/0.22
0.43/0.32
0.56/0.42
1770 (Bhp/kW)
0.03/0.02
0.04/0.03
0.06/0.04
0.07/0.05
2900 (kW)
0.08
0.13
0.18
0.24
1450 (kW)
0.01
0.02
0.02
0.03
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.
Sound power level ratings are shown in decibels, referred to 10-12 watts calculated per AMCA Standard 301. Values shown are for inlet LwA sound power levels for 100%, 50% and
0% of peak pressure in Installation Type B: Free inlet, Ducted outlet. dBA sound pressure values are weighted with 11.5 dB attenuation for each octave band at 5 feet.
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.
64
Impeller Diameter = 12.25 inches (311 mm)
ft/min = cfm / 0.82
Outlet Velocity
m/s = m ³ /s / 0.08
ft/min = rpm X 3.20
Tip Speed
m/s = rpm X 0.98
65
67
67
66
68
67
69
Volume
Sound Power A-Weighted [LwA]
Sound Pressure [dBA]
Inlet Sound
25
30
35
rpm
LwA
dBA
0.71/0.53
0.88/0.66
1.07/0.80
3500
+20
+8.5
0.09/0.07
0.11/0.09
0.14/0.10
1770
-
-11.5
0.30
0.37
0.45
2900
+13
+1.5
0.04
0.05
0.06
1450
-5
-16.5
And building owners and
occupants value the energy
efficiency, low maintenance
and quiet dependable operation
they experience long after the
construction project ends.
Prepared to Support
Green Building Efforts
Supplement AX July 2004 R
Copyright © 2004 Greenheck Fan Corp.
AX 3
T
Pre
Air density = 1
Air density = 0
Peak Absorbed
rpm
3500 (Bhp/kW)
1770 (Bhp/kW)
2900 (kW)
1450 (kW)
Performance sho
Seal applies to a
Sound power lev
0% of peak pres
b p il C
P d r a o
N e g a
m u
r e b
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