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.
Model size and hub
diameter
Total Pressure Axis
in Pascals (Pa) and
Inches Water Gauge
(in. wg)
Static Pressure
- Lines of constant
static pressure
Color coded power
frequency and motor
speed (rpm)/poles
Volume - Axis
displays two different
units of measure
for each power
frequency and motor
speed.
Blade pitch -
Shown in 5 degree
increments, integral
pitches are available
between the
displayed limits.
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.
Total Efficiency curves - Curves show total efficiency levels at different performance points. Those curves
do not reflect static efficiency levels.
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.
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 m³/s in the
appropriate Outlet Velocity equation. Tip speed equation is only dependent on motor rpm.
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AX 31-160 4 Blades
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Diameter = 12.25 in. 311 mm
Outlet Velocity ft/min = cfm / 0.82
m/s = m³/s / 0.08
Tip Speed ft/min = rpm X 3.20
m/s = rpm X 0.98
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
Air density = 1.2 kg/m
3
Air density = 0.075 lbs/ft
3
Pitch Angle º
rpm
5
10
15
20
25
30
35
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
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
2900 (kW)
0.08
0.13
0.18
0.24
0.30
0.37
0.45
1450 (kW)
0.01
0.02
0.02
0.03
0.04
0.05
0.06
Peak Absorbed Power [Bhp/kW (60 Hz), kW (50 Hz)]
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
Volume
Total
Pressure
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AX 31-160 4 Blades
Air density = 1.2 kg/m
3
Air density = 0.075 lbs/ft
3
Pitch Angle º
rpm
5
10
15
20
25
30
35
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
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
2900 (kW)
0.08
0.13
0.18
0.24
0.30
0.37
0.45
1450 (kW)
0.01
0.02
0.02
0.03
0.04
0.05
0.06
Peak Absorbed Power [Bhp/kW (60 Hz), kW (50 Hz)]
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
Volume
Total
Pressure
Impeller Diameter = 12.25 inches
(311 mm)
Outlet Velocity
ft/min = cfm / 0.82
m/s = m³/s / 0.08
Tip Speed
ft/min = rpm X 3.20
m/s = rpm X 0.98
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.
Air density = 1.2 kg/m³
Air density = 0.075 lbs/ft³
Pitch Angle º
rpm
5
10
15
20
25
30
35
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
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
2900 (kW)
0.08
0.13
0.18
0.24
0.30
0.37
0.45
1450 (kW)
0.01
0.02
0.02
0.03
0.04
0.05
0.06
Peak Absorbed Power [Bhp/kW (60 Hz), kW (50 Hz)]
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
Volume
Total
Pressure
Impeller Diameter = 12.25 inches (
311 mm
)
Outlet Velocity
ft/min = cfm / 0.82
m/s = m³/s / 0.08
Tip Speed
ft/min = rpm X 3.20
m/s = rpm X 0.98
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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.
AX 31-160 4 Blades
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How to use this performance manual
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