Roof downblast - exhaust belt drive gb, Roof downblast - exhaust belt drive gb-480 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 44
44
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-480
Damper Size = 48 x 48
(1219 x 1219)
Roof Opening = 50½ x 50½
(1283 x 1283)
Shroud Thickness = 0.080
(2.0)
Motor Cover Thickness = 0.064
(1.6)
Curb Cap Thickness = 0.100
(2.5)
^Approximate Unit Weight = 623 lbs.
(283 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
DO
N
OT
S
EL
EC
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 x 1000)
3
Volume (m /hr x 1000)
RPM
(Belt)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
73
3
⁄
4
(1873)
11
1
⁄
4
(286)
*47
1
⁄
4
(1200)
58
(1473)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0
0.125
0.25
0.375
0.5
0.625
0.75
0.875
1
1.25
480
1/2
200
CFM
12020
10059
6529
BHP
0.51
0.55
0.48
Sones
7.3
6.6
7.3
3/4
225
CFM
13522
11811
9500
BHP
0.73
0.77
0.76
Sones
8.3
8.0
7.6
1
250
CFM
15025
13516
11662
8820
BHP
1.00
1.05
1.06
0.98
Sones
9.5
9.5
8.6
8.1
1
1
⁄
2
285
CFM
17129
15830
14379
12517
9587
BHP
1.48
1.54
1.58
1.56
1.42
Sones
11.8
11.2
10.7
10.0
9.1
2
310
CFM
18631
17437
16135
14589
12656
BHP
1.90
1.97
2.02
2.02
1.97
Sones
14.0
13.0
12.2
12.0
11.5
3
360
CFM
21636
20608
19548
18385
17010
15420
13507
BHP
2.98
3.06
3.13
3.17
3.17
3.21
3.00
Sones
17.6
17.0
16.4
15.9
15.5
15.0
14.2
5
393
CFM
23619
22678
21736
20683
19605
18254
16764
15086
BHP
3.87
3.66
4.05
4.10
4.14
4.12
4.06
3.94
Sones
20
19.9
19.5
18.8
18.3
18.0
17.5
16.7
415
CFM
24942
24050
23158
22189
21181
20012
18733
17211
15486
BHP
4.56
4.65
4.75
4.81
4.85
4.86
4.84
4.74
4.58
Sones
22
22
22
21
21
20
20
19.1
18.1
425
CFM
25542
24672
23801
22868
21883
20799
19550
18156
16604
BHP
4.90
4.99
5.09
5.16
5.20
5.22
5.20
5.13
5.00
Sones
23
23
23
22
22
21
21
20
19.3
7
1
⁄
2
455
CFM
27345
26532
25719
24886
23966
23046
21953
20786
19471
15870
BHP
6.01
6.11
6.22
6.31
6.36
6.41
6.41
6.38
6.30
5.85
Sones
27
27
27
26
26
25
25
24
24
21
485
CFM
29149
28386
27623
26860
26016
25153
24290
23201
22106
19517
BHP
7.28
7.39
7.50
7.61
7.67
7.72
7.78
7.75
7.73
7.49
Sones
31
31
31
31
30
29
29
28
28
26
MAXIMUM BHP AT A GIVEN RPM = (RPM/245)
3
MAXIMUM RPM = 485
TIP SPEED (ft/min) = RPM x 12.632
MAXIMUM MOTOR FRAME SIZE = 215T