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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.
Roof Downblast - Exhaust
Belt & Direct Drive
GB-200 • G-203
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 G/GB = 119/144 lbs. (54/65 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)
35
1
⁄2
(902)
5
1
⁄2 (140)
*28
(711)
30
(762)
Motor HP
Fan
RPM
Static Pressure in Inches wg
Belt Direct 0 0.125 0.25 0.375 0.5 0.75 1.0 1.25 1.5 1.75
200 203
1/4
440
CFM
2435 1976
BHP
0.1 0.1
Sones
6.5 5.8
600
CFM
3320 2984 2637 2089
BHP
0.25 0.26 0.26 0.25
Sones
8.5 7.9 7.3 6.1
1/3 665
CFM
3680 3378 3085 2706 2087
BHP
0.34 0.34 0.35 0.35 0.33
Sones
9.6 9 8.5 7.7 6.7
1/2
718
CFM
3973 3700 3422 3109 2684
BHP
0.43 0.43 0.45 0.45 0.44
Sones
10.8 10 9.6 9 8.3
770
CFM
4261 4013 3744 3477 3141
BHP
0.52 0.53 0.55 0.55 0.55
Sones
12.1 11 10.7 10.2 9.8
3/4 C-3/4 860
CFM
4759 4548 4289 4068 3811 3085
BHP
0.73 0.74 0.75 0.77 0.77 0.74
Sones
14.1 13.3 12.9 12.4 11.8 11.1
1 965
CFM
5340 5158 4927 4720 4520 4015 3240
BHP
1.03 1.04 1.05 1.08 1.09 1.08 1.02
Sones
16.7 16 15.4 15 14.5 13.7 13
1-1/2
1028
CFM
5689 5517 5309 5101 4918 4488 3911 2941
BHP
1.25 1.26 1.27 1.29 1.31 1.32 1.28 1.14
Sones
18.5 17.8 17.2 16.8 16.4 15.6 14.7 14.6
1090
CFM
6032 5870 5682 5473 5301 4925 4450 3751
BHP
1.49 1.5 1.51 1.52 1.56 1.56 1.56 1.48
Sones
20 19.6 18.9 18.4 18.1 17.5 16.8 15.8
2
B-2 1140
CFM
6308 6154 5980 5779 5606 5267 4832 4287 3439
BHP
1.7 1.71 1.72 1.74 1.77 1.79 1.79 1.75 1.61
Sones
22 21 21 20 19.7 19.1 18.5 17.5 16.5
1200
CFM
6640 6494 6336 6145 5969 5651 5274 4829 4177 3077
BHP
1.99 2 2.01 2.02 2.04 2.09 2.09 2.08 1.99 1.69
Sones
24 23 23 22 22 21 21 19.9 18.6 16.7
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
C-860-RPM B-1140-RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/938)
3
MAXIMUM RPM = 1200
TIP SPEED (ft/min) = RPM x 5.596
MAXIMUM MOTOR FRAME SIZE = 184T
Direct Drive RPM