Roof downblast - exhaust belt drive gb-240 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 35
35
Roof Downblast - Exhaust
Belt Drive
GB-240
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)
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 = 165 lbs.
(75 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
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
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
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0
0.125
0.25
0.375
0.5
0.625
0.75
1
1.25
1.5
240
1/4
425
CFM
3902
3422
2691
BHP
0.19
0.21
0.20
Sones
5.9
5.9
4.7
460
CFM
4223
3785
3188
2036
BHP
0.24
0.26
0.27
0.22
Sones
6.7
6.6
5.7
4.2
1/3
505
CFM
4637
4242
3761
3060
BHP
0.32
0.35
0.35
0.34
Sones
7.8
7.5
6.9
6.1
1/2
585
CFM
5371
5031
4666
4195
3562
2112
BHP
0.50
0.53
0.54
0.55
0.53
0.41
Sones
10.3
9.7
9.1
8.8
8.2
7.2
3/4
623
CFM
5720
5400
5069
4660
4131
3428
BHP
0.60
0.64
0.65
0.66
0.65
0.61
Sones
11.7
11.0
10.4
10.0
9.6
9.1
660
CFM
6060
5757
5449
5094
4636
4073
3217
BHP
0.71
0.75
0.78
0.79
0.78
0.76
0.69
Sones
13.1
12.4
11.8
11.3
11.0
10.6
10.4
1
730
CFM
6702
6428
6158
5861
5507
5077
4568
BHP
0.96
1.01
1.05
1.05
1.06
1.06
1.03
Sones
15.8
15.0
14.3
13.8
13.4
13.1
12.9
1
1
⁄
2
778
CFM
7143
6886
6632
6363
6058
5700
5266
4145
BHP
1.16
1.21
1.26
1.27
1.28
1.29
1.28
1.18
Sones
17.7
16.6
15.9
15.4
15.0
14.7
14.4
13.2
825
CFM
7575
7332
7092
6844
6574
6261
5901
5002
BHP
1.39
1.44
1.49
1.51
1.52
1.54
1.53
1.48
Sones
19.7
18.6
17.7
17.2
16.8
16.4
16.2
14.8
2
870
CFM
7988
7757
7529
7300
7055
6775
6457
5680
7757
BHP
1.63
1.68
1.73
1.77
1.78
1.80
1.80
1.77
1.68
Sones
22
21
19.6
19.1
18.7
18.3
17.9
16.9
21
910
CFM
8355
8135
7916
7700
7467
7215
6933
6240
5388
3707
BHP
1.86
1.92
1.97
2.02
2.03
2.05
2.06
2.05
1.97
1.66
Sones
24
23
21
21
21
20
19.6
19.2
16.7
13.6
MAXIMUM BHP AT A GIVEN RPM = (RPM/715)
3
MAXIMUM RPM = 910
TIP SPEED (ft/min) = RPM x 6.414
MAXIMUM MOTOR FRAME SIZE = 184T
42
3
⁄
4
(1086)
*31
1
⁄
2
(800)
5
3
⁄
4
(146)
34
(864)