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Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects
of a birdscreen. The sound ratings shown are loudness values in hemispherical sones at 5 ft. (1.5 m) in a hemispherical free field calculated per AMCA Standard 301.
Values shown are for installation type A: free inlet hemispherical sone levels.
D
O
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
O
F
T
H
I
S
S
Y
S
T
E
M
C
U
R
V
E
Static Pressure (in. wg)
Static Pressure (Pa)
Volume (cfm)
3
Volume (m /hr )
RPM (Belt)
RPM (Direct)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
Roof Downblast - Exhaust
Belt & Direct Drive
GB-161 • G-163
Damper Size = 16 x 16
Roof Opening = 18 x 18 (470 x 470)
Shroud Thickness = 0.051 (1.3)
Motor Cover Thickness = 0.040 (1.0)
Curb Cap Thickness = 0.064 (1.6)
^Approximate Unit Weight G/GB = 101/88 lbs. (46/40 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
1
3
⁄4 (44)
28
3
⁄8
(619)
4 (102)
*23
3
⁄4
(603)
22
(559)
Motor HP
Fan
RPM
Static Pressure in Inches wg
Belt Direct 0 0.125 0.25 0.375 0.5 0.75 0.875 1 1.25 1.5
161 163
1/4
580
CFM
1713 1417 970
BHP
0.07 0.08 0.07
Sones
5.8 5.6 5.3
720
CFM
2127 1893 1632 1243
BHP
0.14 0.15 0.15 0.14
Sones
7.8 7.5 7.2 6.8
C-1/4 860
CFM
2540 2344 2145 1913 1596
BHP
0.23 0.24 0.25 0.26 0.24
Sones
10.5 10.0 9.6 9.3 8.7
1/3 945
CFM
2791 2612 2434 2236 2010
BHP
0.31 0.32 0.33 0.34 0.34
Sones
12.6 12.0 11.5 11.2 10.7
1/2
1050
CFM
3102 2940 2782 2616 2429 1937 1582
BHP
0.42 0.44 0.45 0.46 0.47 0.44 0.41
Sones
14.4 13.8 13.2 12.9 12.6 11.6 10.7
1100
CFM
3249 3095 2943 2787 2615 2198 1900
BHP
0.48 0.50 0.52 0.53 0.53 0.52 0.50
Sones
15.3 14.7 14.1 13.8 13.5 12.5 12.0
3/4
B-1/2 1140
CFM
3367 3219 3072 2922 2761 2382 2125 1808
BHP
0.54 0.56 0.57 0.58 0.59 0.59 0.57 0.54
Sones
15.9 15.4 14.9 14.5 14.2 13.3 12.9 12.1
1250
CFM
3692 3557 3422 3289 3149 2838 2658 2444
BHP
0.71 0.73 0.75 0.76 0.77 0.79 0.78 0.76
Sones
17.9 17.4 17.0 16.6 16.3 15.6 15.2 14.9
1 1375
CFM
4062 3938 3815 3694 3571 3304 3161 3007 2609 2073
BHP
0.95 0.97 0.99 1.01 1.02 1.04 1.05 1.04 1.01 0.93
Sones
21.0 20.0 19.6 19.2 18.9 18.4 18.0 17.6 17.2 15.4
1-1/2 1575
CFM
4652 4545 4437 4330 4225 4007 3894 3769 3512 3198
BHP
1.42 1.45 1.47 1.49 1.51 1.54 1.56 1.56 1.57 1.54
Sones
26.0 25.0 25.0 24.0 24.0 24.0 23.0 23.0 22.0 22.0
C-860-
RPM B-1140-RPM A-1725-RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/1355)
3
MAXIMUM RPM - GB-161=1575, G-163=1725
TIP SPEED (ft/min) = RPM x 4.352
MAXIMUM MOTOR FRAME SIZE = 145T
Direct Drive RPM