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Roof Downblast - Exhaust
Belt Drive
GB-420
65
1
⁄
4
(1657)
52
(1321)
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
Curb Cap Thickness = 0.100
(2.5)
^Approximate Unit Weight = 495 lbs.
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
Motor
Fan
HP
RPM
0
420
8242
CFM
200
0.27
BHP
3.1
Sones
1/2
9890
CFM
240
BHP
0.46
4.6
Sones
CFM
11332
3/4
275
BHP
0.69
Sones
6.2
12568
CFM
1
305
0.95
BHP
Sones
8.0
14217
CFM
1
1
⁄
345
1.37
BHP
2
11.7
Sones
CFM
15659
2
380
BHP
1.83
14.4
Sones
CFM
17925
3
435
BHP
2.74
Sones
19.0
19574
CFM
475
3.57
BHP
22
Sones
5
21222
CFM
515
4.55
BHP
24
Sones
CFM
22994
558
BHP
5.79
Sones
27
7
1
⁄
2
CFM
24725
600
BHP
7.20
Sones
30
Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects
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.
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.
Values shown are for installation type A: free inlet hemispherical sone levels.
*44
(1118)
9
3
⁄
(248)
4
1
3
⁄
(44)
4
(1.6)
(225 kg)
0.125
0.25
0.375
6454
0.29
2.9
8573
6365
0.50
0.48
5.0
4.9
10219
8698
0.75
0.76
6.8
5.6
11579
10320
8672
1.01
1.03
1.01
8.4
7.5
7.2
13357
12411
11102
1.45
1.49
1.50
11.3
10.8
10.1
14892
14043
12983
1.92
1.97
2.00
13.8
13.3
12.7
17264
16540
15792
2.86
2.93
2.97
18.4
17.8
17.3
18968
18320
17640
3.69
3.78
3.84
21
20
19.8
20663
20081
19459
4.68
4.80
4.87
24
23
22
22478
21957
21383
5.93
6.07
6.15
27
26
25
24245
23765
23243
7.35
7.51
7.61
30
30
29
Volume (cfm x 1000)
Volume (m /hr x 1000)
Static Pressure in Inches wg
0.50
0.625
0.75
MAXIMUM BHP AT A GIVEN RPM = (RPM/302)
MAXIMUM RPM = 600
TIP SPEED (ft/min) = RPM x 11.061
MAXIMUM MOTOR FRAME SIZE = 215T
9463
1.45
9.6
11787
10108
2.00
1.91
12.3
12.0
14790
13764
12502
2.99
3.00
2.95
16.6
16.4
16.5
16887
15929
14994
3.88
3.90
3.91
19.3
18.6
18.3
18826
18046
17162
4.92
4.95
4.98
21
21
20
20805
20219
19446
6.22
6.28
6.31
24
24
23
22709
22166
21621
7.70
7.76
7.81
27
27
26
RPM (Belt)
HP
3
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
1.00
1.25
1.5
3
12315
3.69
18.3
15254
12312
4.92
4.56
19.4
19.1
17835
15908
6.34
6.21
23
22
20104
18585
16590
7.87
7.86
7.64
26
26
26
43
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