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Roof Downblast - Exhaust
Belt Drive
GB-220
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.
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.
1
3
⁄4 (44)
Damper Size = 24 x 24 (610 x 610)
Roof Opening = 26 x 26 (673 x 673)
Shroud Thickness = 0.064 (1.6)
Motor Cover Thickness = 0.040 (1.0)
Curb Cap Thickness = 0.064 (1.6)
^Approximate Unit Weight = 164 lbs. (74 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
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 x 1000)
3
Volume (m
/hr x 1000)
RPM (Belt)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0 0.125 0.25 0.375 0.5 0.625 0.75 1 1.25 1.5
220
1/4
425
CFM
3230 2879 2296
BHP
0.14 0.16 0.16
Sones
7.4 7.2 6.9
465
CFM
3533 3219 2758 1951
BHP
0.18 0.20 0.21 0.19
Sones
8.1 7.8 7.4 7.0
500
CFM
3799 3512 3132 2542
BHP
0.23 0.25 0.26 0.26
Sones
8.8 8.4 7.9 7.5
1/3 550
CFM
4179 3924 3629 3158 2526
BHP
0.30 0.32 0.34 0.35 0.33
Sones
10.0 9.6 8.9 8.4 8.0
1/2 640
CFM
4863 4654 4403 4120 3702 3208
BHP
0.48 0.50 0.53 0.54 0.55 0.54
Sones
13.0 12.8 12.1 11.2 10.5 9.7
3/4 710
CFM
5395 5206 4990 4762 4459 4077 3633
BHP
0.65 0.68 0.71 0.73 0.74 0.75 0.74
Sones
15.0 14.9 14.4 13.6 12.8 12.1 11.2
1
755
CFM
5737 5559 5362 5148 4920 4579 4206 3095
BHP
0.79 0.82 0.84 0.87 0.89 0.90 0.90 0.82
Sones
15.7 15.6 15.2 14.6 14.0 13.4 12.7 11.2
800
CFM
6079 5911 5732 5530 5326 5049 4716 3929
BHP
0.93 0.97 1.00 1.02 1.05 1.06 1.07 1.05
Sones
16.6 16.4 16.1 15.6 15.2 14.6 14.2 12.5
1
1
⁄2
848
CFM
6444 6286 6122 5932 5741 5540 5236 4566 3542
BHP
1.11 1.15 1.18 1.21 1.23 1.26 1.27 1.27 1.17
Sones
17.8 17.5 17.2 16.9 16.5 16.2 15.7 14.5 13.4
895
CFM
6801 6651 6501 6323 6142 5960 5723 5122 4401
BHP
1.31 1.34 1.38 1.41 1.44 1.47 1.49 1.50 1.47
Sones
19.4 19.1 18.8 18.5 18.2 18.0 17.6 16.9 15.5
2 985
CFM
7485 7349 7212 7062 6898 6734 6568 6107 5548 4883
BHP
1.74 1.78 1.82 1.86 1.89 1.92 1.95 1.99 2.00 1.96
Sones
23 23 23 22 22 22 22 21 20 19.0
MAXIMUM BHP AT A GIVEN RPM = (RPM/782)
3
MAXIMUM RPM = 985
TIP SPEED (ft/min) = RPM x 6.283
MAXIMUM MOTOR FRAME SIZE = 184T
42
3
⁄4
(1086)
*31
1
⁄2
(800)
5
3
⁄4 (146)
34
(864)