Roof downblast - exhaust belt drive gb-420 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 43
43
Roof Downblast - Exhaust
Belt Drive
GB-420
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 = 42 x 42
(1067 x 1067)
Roof Opening = 44½ x 44½
(1130 x 1130)
Shroud Thickness = 0.080
(2.0)
Motor Cover Thickness = 0.064
(1.6)
Curb Cap Thickness = 0.100
(2.5)
^Approximate Unit Weight = 495 lbs.
(225 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
DO
NO
T
SE
LE
C
T
TO
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
65
1
⁄
4
(1657)
9
3
⁄
4
(248)
*44
(1118)
52
(1321)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0
0.125
0.25
0.375
0.50
0.625
0.75
1.00
1.25
1.5
420
1/2
200
CFM
8242
6454
BHP
0.27
0.29
Sones
3.1
2.9
240
CFM
9890
8573
6365
BHP
0.46
0.50
0.48
Sones
4.6
5.0
4.9
3/4
275
CFM
11332
10219
8698
BHP
0.69
0.75
0.76
Sones
6.2
6.8
5.6
1
305
CFM
12568
11579
10320
8672
BHP
0.95
1.01
1.03
1.01
Sones
8.0
8.4
7.5
7.2
1
1
⁄
2
345
CFM
14217
13357
12411
11102
9463
BHP
1.37
1.45
1.49
1.50
1.45
Sones
11.7
11.3
10.8
10.1
9.6
2
380
CFM
15659
14892
14043
12983
11787
10108
BHP
1.83
1.92
1.97
2.00
2.00
1.91
Sones
14.4
13.8
13.3
12.7
12.3
12.0
3
435
CFM
17925
17264
16540
15792
14790
13764
12502
BHP
2.74
2.86
2.93
2.97
2.99
3.00
2.95
Sones
19.0
18.4
17.8
17.3
16.6
16.4
16.5
5
475
CFM
19574
18968
18320
17640
16887
15929
14994
12315
BHP
3.57
3.69
3.78
3.84
3.88
3.90
3.91
3.69
Sones
22
21
20
19.8
19.3
18.6
18.3
18.3
515
CFM
21222
20663
20081
19459
18826
18046
17162
15254
12312
BHP
4.55
4.68
4.80
4.87
4.92
4.95
4.98
4.92
4.56
Sones
24
24
23
22
21
21
20
19.4
19.1
7
1
⁄
2
558
CFM
22994
22478
21957
21383
20805
20219
19446
17835
15908
BHP
5.79
5.93
6.07
6.15
6.22
6.28
6.31
6.34
6.21
Sones
27
27
26
25
24
24
23
23
22
600
CFM
24725
24245
23765
23243
22709
22166
21621
20104
18585
16590
BHP
7.20
7.35
7.51
7.61
7.70
7.76
7.81
7.87
7.86
7.64
Sones
30
30
30
29
27
27
26
26
26
26
MAXIMUM BHP AT A GIVEN RPM = (RPM/302)
3
MAXIMUM RPM = 600
TIP SPEED (ft/min) = RPM x 11.061
MAXIMUM MOTOR FRAME SIZE = 215T