Roof downblast - exhaust belt drive gb-330 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 40
40
Roof Downblast - Exhaust
Belt Drive
GB-330
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 = 36 x 36
(914 x 914)
Roof Opening = 38½ x 38½
(978 x 978)
Shroud Thickness = 0.080
(2.0)
Motor Cover Thickness = 0.064
(1.6)
Curb Cap Thickness = 0.080
(2.0)
^Approximate Unit Weight = 385 lbs.
(175 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
58
3
⁄
4
(1492)
8
7
⁄
8
(225)
*38
1
⁄
2
(978)
46
(1168)
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
330
1/3
255
CFM
6159
5043
3236
BHP
0.22
0.25
0.22
Sones
5.2
4.9
4.8
275
CFM
6643
5633
4308
BHP
0.28
0.31
0.31
Sones
5.9
5.5
5.2
1/2
325
CFM
7850
7029
6036
4757
BHP
0.46
0.50
0.52
0.50
Sones
8.5
8.3
7.4
7.1
3/4
370
CFM
8937
8232
7410
6480
5257
BHP
0.68
0.73
0.76
0.76
0.72
Sones
10.2
9.8
9.2
8.4
8.3
1
415
CFM
10024
9401
8713
7927
7050
BHP
0.95
1.01
1.06
1.07
1.07
Sones
12.6
11.9
11.3
10.6
10.0
1
1
⁄
2
465
CFM
11232
10683
10087
9425
8706
6966
BHP
1.34
1.40
1.46
1.50
1.51
1.46
Sones
15.1
14.6
14.0
13.4
12.8
11.7
2
510
CFM
12319
11824
11294
10719
10085
8696
6472
BHP
1.77
1.84
1.91
1.96
1.98
1.99
1.79
Sones
17.7
17.2
16.6
16.1
15.6
14.4
13.9
3
550
CFM
13285
12828
12340
11822
11266
10041
8616
BHP
2.22
2.29
2.37
2.43
2.47
2.51
2.46
Sones
19.6
19.2
18.7
18.2
17.7
16.7
15.7
590
CFM
14251
13825
13376
12908
12408
11307
10081
8536
BHP
2.74
2.82
2.90
2.98
3.03
3.09
3.08
2.95
Sones
22
21
21
20
19.8
18.8
17.7
17.1
5
645
CFM
15580
15190
14786
14366
13922
12958
11912
10749
9292
BHP
3.57
3.66
3.75
3.84
3.91
4.00
4.04
4.01
3.85
Sones
24
24
24
23
23
22
21
20
19.4
700
CFM
16908
16549
16185
15798
15408
14564
13624
12640
11538
10184
BHP
4.57
4.66
4.761
4.86
4.95
5.08
5.14
5.17
5.12
4.94
Sones
28
27
27
27
27
26
25
24
23
22
MAXIMUM BHP AT A GIVEN RPM = (RPM/405)
3
MAXIMUM RPM = 700
TIP SPEED (ft/min) = RPM x 9.425
MAXIMUM MOTOR FRAME SIZE = 215T