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Roof Downblast - Exhaust
Belt Drive
GB-300HP
50
(1270)
40
(1016)
Damper Size = 30 x 30
(762 x 762)
Roof Opening = 32½ x 32½
(826 x 826)
Shroud Thickness = 0.064
(1.6)
Motor Cover Thickness = 0.051
Curb Cap Thickness = 0.064
(1.6)
^Approximate Unit Weight = 320 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
0.5
300HP
2912
CFM
460
0.41
BHP
9.7
Sones
1/2
3602
CFM
495
BHP
0.53
10.3
Sones
CFM
4662
3/4
565
BHP
0.77
Sones
11.8
5398
CFM
1
620
1.01
BHP
Sones
13.4
6542
CFM
1
1
⁄
710
1.48
BHP
2
17.2
Sones
CFM
7013
748
BHP
1.71
Sones
18.8
2
CFM
7460
785
BHP
1.96
Sones
20
8107
CFM
840
2.37
BHP
23
Sones
3
8746
CFM
895
2.84
BHP
25
Sones
CFM
9722
980
BHP
3.68
Sones
32
5
CFM
10688
1065
BHP
4.67
Sones
44
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.
*36
(914)
8
1
⁄
(210)
4
1
3
⁄
(44)
4
(1.3)
(145 kg)
0.75
1
1.25
3600
0.76
10.4
4652
3309
1.04
0.94
12.3
10.6
5954
5269
4221
1.53
1.55
1.47
16.0
15.3
13.4
6462
5889
5027
1.78
1.81
1.78
17.5
17.0
15.7
6943
6402
5737
2.04
2.08
2.10
19.1
18.5
17.9
7642
7146
6636
2.46
2.52
2.57
22
21
21
8328
7870
7394
2.95
3.03
3.07
24
23
23
9356
8951
8531
3.81
3.90
3.99
31
29
28
10351
10006
9621
4.81
4.94
5.04
42
37
37
Volume (cfm x 1000)
Volume (m /hr x 1000)
Static Pressure in Inches wg
1.5
1.75
2
MAXIMUM BHP AT A GIVEN RPM = (RPM/613)
MAXIMUM RPM = 1065
TIP SPEED (ft/min) = RPM x 7.985
MAXIMUM MOTOR FRAME SIZE = 184T
4800
2.00
16.2
5922
4992
2.56
2.43
19.7
18.0
6892
6150
5245
3.11
3.08
2.92
23
22
19.8
8094
7657
7029
4.03
4.08
4.09
27
26
25
9233
8831
8429
5.12
5.17
5.23
36
35
33
RPM (Belt)
HP
3
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
2.25
2.5
2.75
3
6264
5222
3.95
3.69
24
23
7903
7255
6543
5.24
5.17
5.01
31
30
29
39
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