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Roof Downblast - Exhaust
Belt Drive
GB-260
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 = 305 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
260
3875
CFM
300
0.12
BHP
8.0
Sones
1/4
4714
CFM
365
BHP
0.22
9.2
Sones
CFM
5231
1/3
405
BHP
0.30
Sones
10.4
6005
CFM
1/2
465
0.45
BHP
Sones
11.4
6716
CFM
3/4
520
0.63
BHP
12.9
Sones
CFM
7491
1
580
BHP
0.88
14.4
Sones
CFM
8588
1
1
⁄
665
BHP
1.33
2
Sones
16.7
9041
CFM
700
1.55
BHP
17.8
Sones
2
9493
CFM
735
1.79
BHP
18.9
Sones
CFM
10138
785
BHP
2.18
Sones
21
3
CFM
10784
835
BHP
2.62
Sones
23
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)
(138 kg)
0.125
0.25
0.5
3121
1727
0.14
0.12
7.1
7.4
4130
3393
0.25
0.26
8.8
8.6
4716
4095
0.33
0.35
10.3
10.3
5570
5063
3745
0.50
0.52
0.53
10.9
10.4
9.6
6324
5898
4869
0.68
0.72
0.75
12.1
11.3
10.3
7137
6775
5912
0.93
0.98
1.04
13.7
13.0
12.2
8278
7979
7274
1.39
1.44
1.53
16.2
15.8
15.0
8746
8460
7811
1.61
1.67
1.77
17.4
17.0
16.2
9212
8938
8335
1.86
1.92
2.03
18.6
18.3
17.6
9875
9617
9069
2.26
2.33
2.44
20
20
19.7
10537
10292
9794
2.70
2.78
2.91
23
22
22
Volume (cfm x 1000)
Volume (m /hr x 1000)
Static Pressure in Inches wg
0.75
1
1.25
MAXIMUM BHP AT A GIVEN RPM = (RPM/572)
MAXIMUM RPM = 835
TIP SPEED (ft/min) = RPM x 7.985
MAXIMUM MOTOR FRAME SIZE = 184T
3008
0.64
9.4
4826
1.03
11.0
6474
5465
3608
1.57
1.55
1.29
14.2
13.3
12.8
7068
6227
4912
1.82
1.83
1.71
15.5
14.8
13.8
7649
6878
5916
2.10
2.13
2.09
16.8
16.2
15.6
8452
7769
7006
2.53
2.58
2.59
18.9
18.2
17.9
9225
8606
7932
3.02
3.08
3.12
21
20
19.9
RPM (Belt)
HP
3
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
1.5
1.75
2
3
4236
1.80
14.9
5949
4189
2.49
2.11
17.1
16.7
7157
6024
4294
3.10
2.93
2.49
19.7
18.7
18.6
37
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