Roof downblast - exhaust belt drive gb-180hp – 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.
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 = 142 lbs.
(64 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
Roof Downblast - Exhaust
Belt Drive
GB-180HP
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
180HP
1/4
795
CFM
1547
BHP
0.22
Sones
8.6
845
CFM
1759
BHP
0.26
Sones
9.1
1/3
935
CFM
2114
1686
BHP
0.35
0.35
Sones
10.3
9.6
1/2
1075
CFM
2601
2316
1920
BHP
0.51
0.53
0.52
Sones
12.9
12.1
11.6
3/4
1150
CFM
2847
2607
2298
1811
BHP
0.61
0.64
0.65
0.62
Sones
14.6
13.1
12.6
12.3
1225
CFM
3088
2880
2610
2277
1711
BHP
0.73
0.77
0.78
0.78
0.72
Sones
16.3
14.7
13.9
13.3
13.2
1
1350
CFM
3485
3296
3095
2840
2540
2059
BHP
0.96
1.00
1.04
1.05
1.05
0.99
Sones
19.5
17.6
16.4
15.8
15.0
15.1
1
1
⁄
2
1445
CFM
3782
3604
3428
3213
2969
2670
2216
BHP
1.16
1.21
1.25
1.28
1.29
1.28
1.21
Sones
22
20
18.8
17.8
17.3
16.4
16.6
1540
CFM
4076
3909
3744
3576
3353
3119
2827
2407
BHP
1.39
1.44
1.49
1.53
1.55
1.56
1.55
1.48
Sones
25
22
21
20
19.6
18.9
18.1
18.3
2
1620
CFM
4319
4163
4005
3848
3663
3450
3223
2923
2512
BHP
1.60
1.66
1.71
1.76
1.79
1.81
1.82
1.80
1.72
Sones
27
25
24
23
22
21
20
19.7
19.8
1700
CFM
4560
4414
4263
4114
3964
3764
3560
3340
3037
2642
BHP
1.84
1.90
1.96
2.01
2.06
2.08
2.10
2.11
2.07
1.99
Sones
30
27
26
25
24
23
22
22
21
21
DO
N
O
T
SE
LE
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)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
MAXIMUM BHP AT A GIVEN RPM = (RPM/1325)
3
MAXIMUM RPM = 1700
TIP SPEED (ft/min) = RPM x 4.843
MAXIMUM MOTOR FRAME SIZE = 184T
1
3
⁄
4
(44)
5
1
⁄
2
(140)
*28
(711)
30
(762)
35
1
⁄
2
(902)