Roof downblast - exhaust belt drive gb-220 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 33
33
Roof Downblast - Exhaust
Belt Drive
GB-220
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 = 164 lbs.
(74 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
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 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
220
1/4
425
CFM
3230
2879
2296
BHP
0.14
0.16
0.16
Sones
7.4
7.2
6.9
465
CFM
3533
3219
2758
1951
BHP
0.18
0.20
0.21
0.19
Sones
8.1
7.8
7.4
7.0
500
CFM
3799
3512
3132
2542
BHP
0.23
0.25
0.26
0.26
Sones
8.8
8.4
7.9
7.5
1/3
550
CFM
4179
3924
3629
3158
2526
BHP
0.30
0.32
0.34
0.35
0.33
Sones
10.0
9.6
8.9
8.4
8.0
1/2
640
CFM
4863
4654
4403
4120
3702
3208
BHP
0.48
0.50
0.53
0.54
0.55
0.54
Sones
13.0
12.8
12.1
11.2
10.5
9.7
3/4
710
CFM
5395
5206
4990
4762
4459
4077
3633
BHP
0.65
0.68
0.71
0.73
0.74
0.75
0.74
Sones
15.0
14.9
14.4
13.6
12.8
12.1
11.2
1
755
CFM
5737
5559
5362
5148
4920
4579
4206
3095
BHP
0.79
0.82
0.84
0.87
0.89
0.90
0.90
0.82
Sones
15.7
15.6
15.2
14.6
14.0
13.4
12.7
11.2
800
CFM
6079
5911
5732
5530
5326
5049
4716
3929
BHP
0.93
0.97
1.00
1.02
1.05
1.06
1.07
1.05
Sones
16.6
16.4
16.1
15.6
15.2
14.6
14.2
12.5
1
1
⁄
2
848
CFM
6444
6286
6122
5932
5741
5540
5236
4566
3542
BHP
1.11
1.15
1.18
1.21
1.23
1.26
1.27
1.27
1.17
Sones
17.8
17.5
17.2
16.9
16.5
16.2
15.7
14.5
13.4
895
CFM
6801
6651
6501
6323
6142
5960
5723
5122
4401
BHP
1.31
1.34
1.38
1.41
1.44
1.47
1.49
1.50
1.47
Sones
19.4
19.1
18.8
18.5
18.2
18.0
17.6
16.9
15.5
2
985
CFM
7485
7349
7212
7062
6898
6734
6568
6107
5548
4883
BHP
1.74
1.78
1.82
1.86
1.89
1.92
1.95
1.99
2.00
1.96
Sones
23
23
23
22
22
22
22
21
20
19.0
MAXIMUM BHP AT A GIVEN RPM = (RPM/782)
3
MAXIMUM RPM = 985
TIP SPEED (ft/min) = RPM x 6.283
MAXIMUM MOTOR FRAME SIZE = 184T
42
3
⁄
4
(1086)
*31
1
⁄
2
(800)
5
3
⁄
4
(146)
34
(864)