Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
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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 = 20½ x 20½
(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
DO
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
O
F
T
H
IS
S
Y
S
T
E
M
C
U
R
V
E
Static Pr
essur
e (in. wg)
Static Pr
essur
e (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