Roof downblast - exhaust belt drive gb, Roof downblast - exhaust belt drive gb-240hp – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 36
36
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-240HP
Damper Size = 24 x 24
(610 x 610)
Roof Opening = 26½ x 26½
(673 x 673)
Shroud Thickness = 0.064
(1.6)
Motor Cover Thickness = 0.040
(1.0)
Curb Cap Thickness = 0.064
(1.6)
^Approximate Unit Weight = 187 lbs.
(85 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
DO
N
O
T
S
E
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 x 1000)
3
Volume (m /hr x 1000)
RPM
(Belt)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
*31
1
⁄
2
(800)
34
(864)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0.5
0.625
0.75
1
1.25
1.5
1.75
2
2.25
2.5
240HP
1/2
635
CFM
3035
2586
BHP
0.42
0.41
Sones
8.0
7.6
685
CFM
3475
3147
2693
BHP
0.53
0.53
0.51
Sones
9.4
8.8
8.4
3/4
733
CFM
3877
3603
3272
BHP
0.64
0.65
0.65
Sones
11.0
10.3
9.7
780
CFM
4247
4005
3740
2964
BHP
0.76
0.77
0.78
0.75
Sones
12.7
11.9
11.3
10.3
1
860
CFM
4860
4654
4434
3915
3105
BHP
0.99
1.02
1.04
1.05
0.99
Sones
15.9
15.2
14.3
13.2
12.2
1
1
⁄
2
920
CFM
5310
5118
4925
4496
3944
BHP
1.20
1.23
1.25
1.29
1.27
Sones
18.5
17.4
16.6
15.0
13.8
980
CFM
5751
5574
5392
5010
4562
3958
BHP
1.43
1.47
1.49
1.54
1.55
1.52
Sones
22
19.9
19.1
17.2
15.6
14.8
2
1030
CFM
6114
5948
5776
5428
5039
4560
3896
BHP
1.65
1.69
1.72
1.77
1.80
1.80
1.73
Sones
24
23
21
19.6
17.6
16.3
15.7
1080
CFM
6474
6315
6154
5826
5468
5062
4555
3763
BHP
1.89
1.92
1.96
2.02
2.06
2.08
2.05
1.93
Sones
27
26
24
23
20
18.2
17.3
16.7
3
1133
CFM
6853
6702
6550
6237
5914
5560
5133
4588
BHP
2.16
2.20
2.24
2.31
2.36
2.40
2.39
2.35
Sones
29
27
26
24
22
21
19.3
18.7
1240
CFM
7610
7471
7333
7053
6767
6469
6146
5775
5364
4776
BHP
2.80
2.84
2.89
2.97
3.04
3.10
3.14
3.14
3.13
3.04
Sones
31
30
29
28
27
25
24
23
23
22
MAXIMUM BHP AT A GIVEN RPM = (RPM/845)
3
MAXIMUM RPM = 1240
TIP SPEED (ft/min) = RPM x 6.414
MAXIMUM MOTOR FRAME SIZE = 184T
42
3
⁄
4
(1086)
5
3
⁄
4
(146)