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34
Roof Downblast - Exhaust
Belt Drive
GB-220HP
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 = 186 lbs. (84 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
5
3
⁄4 (146)
*31
1
⁄2
(800)
34
(864)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0.5 0.625 0.75 1 1.25 1.5 1.75 2 2.25 2.5
220HP
1/2
650
CFM
2952 2555 1892
BHP
0.47 0.46 0.42
Sones
8.9 8.5 8.3
680
CFM
3215 2871 2440
BHP
0.53 0.53 0.52
Sones
9.4 9.2 8.9
3/4
728
CFM
3614 3312 2974
BHP
0.65 0.65 0.65
Sones
10.6 10.3 9.9
775
CFM
3973 3719 3424 2643
BHP
0.77 0.79 0.79 0.75
Sones
12.0 11.5 11.1 10.5
1 850
CFM
4532 4317 4083 3536 2648
BHP
1.00 1.02 1.04 1.03 0.95
Sones
15.0 13.8 13.5 12.7 12.0
1
1
⁄2
913
CFM
4975 4791 4590 4119 3545 2557
BHP
1.22 1.25 1.27 1.29 1.27 1.13
Sones
16.7 16.0 15.3 14.4 13.5 13.0
975
CFM
5400 5245 5060 4660 4185 3602
BHP
1.46 1.50 1.53 1.57 1.56 1.53
Sones
18.7 18.2 17.5 16.3 15.4 14.8
2
1025
CFM
5740 5591 5432 5075 4643 4157 3492
BHP
1.68 1.72 1.76 1.81 1.82 1.804 1.74
Sones
21 20 19.4 18.2 17.1 16.4 15.6
1075
CFM
6076 5935 5794 5459 5082 4649 4136 3346
BHP
1.93 1.97 2.01 2.06 2.10 2.10 2.07 1.93
Sones
23 22 21 20 18.7 18.3 17.7 16.4
3
1127
CFM
6422 6289 6154 5852 5520 5124 4703 4173 3299
BHP
2.20 2.24 2.29 2.36 2.41 2.42 2.41 2.37 2.17
Sones
24 24 23 22 21 20 19.3 18.6 17.7
1230
CFM
7100 6981 6858 6611 6316 6009 5649 5263 4812 4265
BHP
2.82 2.87 2.92 3.01 3.08 3.14 3.15 3.14 3.10 3.02
Sones
28 27 27 27 25 25 23 22 22 22
MAXIMUM BHP AT A GIVEN RPM = (RPM/838)
3
MAXIMUM RPM = 1230
TIP SPEED (ft/min) = RPM x 6.414
MAXIMUM MOTOR FRAME SIZE = 184T
42
3
⁄4
(1086)