Roof downblast - exhaust belt drive gb, Roof downblast - exhaust belt drive gb-540 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 46
46
Roof Downblast - Exhaust
Belt Drive
GB-
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)
Roof Downblast - Exhaust
Belt Drive
GB-540
Damper Size = 54 x 54
(1371 x 1371)
Roof Opening = 56½ x 56½
(1435 x 1435)
Shroud Thickness = 0.100
(2.5)
Motor Cover Thickness = 0.064
(1.6)
Curb Cap Thickness = 0.100
(2.5)
^Approximate Unit Weight = 748 lbs.
(339 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
DO
NO
T
SE
LE
C
T
TO
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 x 1000)
3
Volume (m /hr x 1000)
RPM
(Belt)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
83
(2108)
14
1
⁄
2
(368)
*50
3
⁄
4
(1289)
64
(1626)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0
0.125
0.25
0.375
0.5
0.75
1
1.25
1.5
1.75
540
1
175
CFM
15488
1250
BHP
0.61
0.65
Sones
6.9
6.3
195
CFM
17258
14674
11068
BHP
0.85
0.90
0.87
Sones
7.8
7.5
7.2
205
CFM
18143
15724
12632
BHP
0.99
1.04
1.03
Sones
8.3
8.2
8.1
1
1
⁄
2
235
CFM
20798
18814
16229
12673
BHP
1.49
1.57
1.56
1.50
Sones
10.1
10.4
10.5
10.6
2
259
CFM
22922
21228
18963
16439
BHP
1.99
2.09
2.11
2.08
Sones
12.3
12.1
11.9
11.6
3
296
CFM
26197
24874
22870
20831
18610
BHP
2.97
3.11
3.14
3.13
3.10
Sones
16.2
15.6
15.3
15.0
14.3
5
351
CFM
31064
30005
28492
26810
25115
21376
BHP
4.96
5.13
5.21
5.24
5.23
5.15
Sones
21
21
19.9
19.3
18.7
17.4
7
1
⁄
2
402
CFM
35578
34653
33552
32075
30612
27519
24274
BHP
7.45
7.65
7.80
7.84
7.87
7.82
7.73
Sones
27
26
26
25
24
23
21
10
442
CFM
39118
38277
37435
36109
34766
32131
29134
26111
BHP
9.90
10.12
10.34
10.39
10.44
10.46
10.36
10.24
Sones
32
32
32
32
32
28
27
26
15
474
CFM
41950
41165
40381
39287
38034
35558
32927
30151
26271
BHP
12.21
12.45
12.68
12.80
12.85
12.90
12.84
12.73
12.42
Sones
36
36
37
36
35
33
31
30
28
505
CFM
44694
43957
43221
42332
41157
38813
36503
33869
31293
26758
BHP
14.77
15.02
15.27
15.45
15.51
15.60
15.60
15.48
15.36
14.84
Sones
40
40
40
40
39
38
36
35
32
30
MAXIMUM BHP AT A GIVEN RPM = (RPM/202)
3
MAXIMUM RPM = 505
TIP SPEED (ft/min) = RPM x 14.137
MAXIMUM MOTOR FRAME SIZE = 256T