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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.
Damper Size = 18 x 18 (457 x 457)
Roof Opening = 20 x 20 (521 x 521)
Shroud Thickness = 0.064 (1.6)
Motor Cover Thickness = 0.040 (1.0)
Curb Cap Thickness = 0.064 (1.6)
^Approximate Unit Weight = 142 lbs. (64 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
Roof Downblast - Exhaust
Belt Drive
GB-180HP
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75
180HP
1/4
795
CFM
1547
BHP
0.22
Sones
8.6
845
CFM
1759
BHP
0.26
Sones
9.1
1/3 935
CFM
2114 1686
BHP
0.35 0.35
Sones
10.3 9.6
1/2 1075
CFM
2601 2316 1920
BHP
0.51 0.53 0.52
Sones
12.9 12.1 11.6
3/4
1150
CFM
2847 2607 2298 1811
BHP
0.61 0.64 0.65 0.62
Sones
14.6 13.1 12.6 12.3
1225
CFM
3088 2880 2610 2277 1711
BHP
0.73 0.77 0.78 0.78 0.72
Sones
16.3 14.7 13.9 13.3 13.2
1 1350
CFM
3485 3296 3095 2840 2540 2059
BHP
0.96 1.00 1.04 1.05 1.05 0.99
Sones
19.5 17.6 16.4 15.8 15.0 15.1
1
1
⁄2
1445
CFM
3782 3604 3428 3213 2969 2670 2216
BHP
1.16 1.21 1.25 1.28 1.29 1.28 1.21
Sones
22 20 18.8 17.8 17.3 16.4 16.6
1540
CFM
4076 3909 3744 3576 3353 3119 2827 2407
BHP
1.39 1.44 1.49 1.53 1.55 1.56 1.55 1.48
Sones
25 22 21 20 19.6 18.9 18.1 18.3
2
1620
CFM
4319 4163 4005 3848 3663 3450 3223 2923 2512
BHP
1.60 1.66 1.71 1.76 1.79 1.81 1.82 1.80 1.72
Sones
27 25 24 23 22 21 20 19.7 19.8
1700
CFM
4560 4414 4263 4114 3964 3764 3560 3340 3037 2642
BHP
1.84 1.90 1.96 2.01 2.06 2.08 2.10 2.11 2.07 1.99
Sones
30 27 26 25 24 23 22 22 21 21
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)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
MAXIMUM BHP AT A GIVEN RPM = (RPM/1325)
3
MAXIMUM RPM = 1700
TIP SPEED (ft/min) = RPM x 4.843
MAXIMUM MOTOR FRAME SIZE = 184T
1
3
⁄4 (44)
5
1
⁄2 (140)
*28
(711)
30
(762)
35
1
⁄2
(902)