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Roof Downblast - Exhaust
Belt Drive
GB-220HP
42
3
⁄
4
(1086)
34
(864)
Damper Size = 24 x 24
(610 x 610)
Roof Opening = 26½ x 26½
Shroud Thickness = 0.064
Motor Cover Thickness = 0.040
Curb Cap Thickness = 0.064
^Approximate Unit Weight = 186 lbs.
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
Motor
Fan
HP
RPM
220HP
CFM
650
BHP
Sones
1/2
CFM
680
BHP
Sones
CFM
728
BHP
Sones
3/4
CFM
775
BHP
Sones
CFM
1
850
BHP
Sones
CFM
913
BHP
Sones
1
1
⁄
2
CFM
975
BHP
Sones
CFM
1025
BHP
Sones
2
CFM
1075
BHP
Sones
CFM
1127
BHP
Sones
3
CFM
1230
BHP
Sones
Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects
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.
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.
Values shown are for installation type A: free inlet hemispherical sone levels.
34
*31
1
⁄
2
(800)
5
3
⁄
(146)
4
1
3
⁄
(44)
4
(673 x 673)
(1.6)
(1.0)
(1.6)
(84 kg)
0.5
0.625
0.75
2952
2555
1892
0.47
0.46
0.42
8.9
8.5
8.3
3215
2871
2440
0.53
0.53
0.52
9.4
9.2
8.9
3614
3312
2974
0.65
0.65
0.65
10.6
10.3
9.9
3973
3719
3424
0.77
0.79
0.79
12.0
11.5
11.1
4532
4317
4083
1.00
1.02
1.04
15.0
13.8
13.5
4975
4791
4590
1.22
1.25
1.27
16.7
16.0
15.3
5400
5245
5060
1.46
1.50
1.53
18.7
18.2
17.5
5740
5591
5432
1.68
1.72
1.76
21
20
19.4
6076
5935
5794
1.93
1.97
2.01
23
22
21
6422
6289
6154
2.20
2.24
2.29
24
24
23
7100
6981
6858
2.82
2.87
2.92
28
27
27
Volume (m /hr x 1000)
Static Pressure in Inches wg
1
1.25
1.5
MAXIMUM BHP AT A GIVEN RPM = (RPM/838)
TIP SPEED (ft/min) = RPM x 6.414
MAXIMUM MOTOR FRAME SIZE = 184T
2643
0.75
10.5
3536
2648
1.03
0.95
12.7
12.0
4119
3545
2557
1.29
1.27
1.13
14.4
13.5
13.0
4660
4185
3602
1.57
1.56
1.53
16.3
15.4
14.8
5075
4643
4157
1.81
1.82
1.804
18.2
17.1
16.4
5459
5082
4649
2.06
2.10
2.10
20
18.7
18.3
5852
5520
5124
2.36
2.41
2.42
22
21
20
6611
6316
6009
3.01
3.08
3.14
27
25
25
RPM (Belt)
HP
Density 0.075 lb/ft
Density 1.2 kg/m
Volume (cfm x 1000)
3
1.75
2
2.25
MAXIMUM RPM = 1230
3492
1.74
15.6
4136
3346
2.07
1.93
17.7
16.4
4703
4173
3299
2.41
2.37
2.17
19.3
18.6
17.7
5649
5263
4812
3.15
3.14
3.10
23
22
22
3
3
2.5
3
4265
3.02
22
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