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Performance Manual Guide
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How to use this performance manual
The performance pages contains information in metric and english units. These are color coded with motor
power frequency and motor speed for easy and quick reference in finding air performance, power requirements,
and sound information. See back cover for selection example.
1
Model size and hub
diameter
2
Total Pressure Axis
in Pascals (Pa) and
Inches Water Gauge
(in. wg)
3
Static Pressure
- Lines of constant
static pressure
4
Color coded power
frequency and motor
speed (rpm)/poles
5
Volume - Axis
displays two different
units of measure
for each power
frequency and motor
speed.
6
Blade pitch -
Shown in 5 degree
increments, integral
pitches are available
between the
displayed limits.
7
Sound power (LwA)
- Color coded sound
power level levels
are displayed as
a percentage of
peak power; 100%,
50% and 0%. Use
corrections in the
sound power table to
find corresponding
LwA and dBA levels
for a specific power
frequency and motor speed.
8
Total Efficiency curves - Curves show total efficiency levels at different performance points. Those curves
do not reflect static efficiency levels.
9
Peak Absorbed Power table - Table displays the maximum power required by pitch angle and motor rpm.
Values provided are in brake horse power and kilowatts.
10
Sound Power and Sound Pressure table - Table displays the corrections required by motor rpm.
Outlet Velocity and Tip Speed formulas - For deriving outlet velocity, use either cfm or m ³ /s in the
11
appropriate Outlet Velocity equation. Tip speed equation is only dependent on motor rpm.
AX 31-160 4 Blades
1
2
Total
Pressure
4
Air density = 1.2 kg/m ³
Air density = 0.075 lbs/ft ³
9
Peak Absorbed Power [Bhp/kW (60 Hz), kW (50 Hz)]
Pitch Angle º
rpm
5
10
3500 (Bhp/kW)
0.19/0.14
0.30/0.22
0.43/0.32
1770 (Bhp/kW)
0.03/0.02
0.04/0.03
0.06/0.04
2900 (kW)
0.08
0.13
1450 (kW)
0.01
0.02
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.
3
11
Impeller Diameter = 12.25 inches (311 mm)
Outlet Velocity
7
Tip Speed
65
67
68
8
66
68
69
Volume
15
20
25
30
35
0.56/0.42
0.71/0.53
0.88/0.66
1.07/0.80
0.07/0.05
0.09/0.07
0.11/0.09
0.14/0.10
0.18
0.24
0.30
0.37
0.45
0.02
0.03
0.04
0.05
0.06
ft/min = cfm / 0.82
m/s = m ³ /s / 0.08
ft/min = rpm X 3.20
m/s = rpm X 0.98
3
67
68
67
6
5
10
Sound Power A-Weighted [LwA]
Sound Pressure [dBA]
Inlet Sound
rpm
LwA
dBA
3500
+20
+8.5
1770
-
-11.5
2900
+13
+1.5
1450
-5
-16.5
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