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.
0
2000
4000
6000
8000
10000
0
200
400
600
0
1000
2000
3000
4000
5000
6000
0.0
0.5
1.0
1.5
2.0
2.5
183-C
2 HP
1.5 H
P
1 HP
3/4
HP
1/2 H
P
1/3 H
P
1/4 H
P
1460
1335
1185
1140
1055
940
860
810
730
495
Static Pr
essur
e (in. wg)
Volume (cfm)
183-B
Volume (m
3
/hr)
Static Pr
essur
e (Pa)
RPM
(Belt)
RPM
(Direct)
RPM
(Vari-Green)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
D
O
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
Roof Downblast - Exhaust
Belt & Direct Drive
GB-180 • G-183
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 = 108/142 lbs.
(49/64 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
0.5
0.75
1
1.25
1.5
1.75
2
180
183
1/4
VG-1
730
CFM
2839
2668
2469
1882
BHP
0.21
0.23
0.25
0.25
Sones
7.4
8.7
7.2
6.7
1/3
810
CFM
3150
2997
2832
2375
BHP
0.29
0.31
0.33
0.35
Sones
8.8
9.9
8.7
8.2
1/2
C-1/2
860
CFM
3344
3202
3049
2647
2015
BHP
0.35
0.36
0.39
0.42
0.4
Sones
10.1
10.8
9.8
9.1
8.1
940
CFM
3655
3527
3388
3052
2601
BHP
0.46
0.47
0.49
0.54
0.54
Sones
12.7
12.8
12.0
11.1
10.3
3/4
1000
CFM
3888
3769
3638
3339
2953
2387
BHP
0.55
0.57
0.58
0.64
0.66
0.63
Sones
15.2
14.7
13.7
13.0
11.9
11.1
VG-2
1055
CFM
4102
3990
3867
3596
3252
2811
BHP
0.65
0.67
0.68
0.74
0.77
0.77
Sones
16.2
15.7
14.9
14.0
12.9
12.4
1
B-1
1140
CFM
4433
4329
4216
3980
3684
3328
2856
BHP
0.81
0.84
0.85
0.93
0.96
0.98
0.95
Sones
17.9
17.4
16.8
16.0
15.1
14.3
13.6
1185
CFM
4608
4508
4401
4179
3900
3575
3178
2499
BHP
0.91
0.94
0.96
1.03
1.07
1.1
1.09
0.99
Sones
19.0
18.4
17.8
17.1
16.2
15.4
14.7
13.7
1
1
⁄
2
1335
CFM
5191
5102
5010
4814
4599
4344
4052
3713
3262
BHP
1.31
1.33
1.36
1.41
1.49
1.54
1.57
1.56
1.51
Sones
22
22
21
21
19.9
19.2
18.7
18.2
17.6
2
1400
CFM
5444
5359
5273
5086
4892
4655
4401
4097
3747
3253
BHP
1.51
1.54
1.56
1.61
1.71
1.75
1.81
1.81
1.79
1.71
Sones
24
23
23
22
22
21
21
20
19.7
19.2
1460
CFM
5677
5596
5514
5336
5155
4938
4699
4426
4123
3765
BHP
1.71
1.74
1.77
1.81
1.93
1.97
2.03
2.05
2.05
2.02
Sones
26
25
24
24
23
23
22
22
22
21
C-860
-
RPM
B-1140
-
RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/1149)
3
MAXIMUM RPM = 1460
TIP SPEED (ft/min) = RPM x 4.843
MAXIMUM MOTOR FRAME SIZE = 184T
Direct Drive RPM