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Roof Downblast - Exhaust
Belt Drive
GB-260
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 = 30 x 30 (762 x 762)
Roof Opening = 32 x 32 (826 x 826)
Shroud Thickness = 0.064 (1.6)
Motor Cover Thickness = 0.051 (1.3)
Curb Cap Thickness = 0.064 (1.6)
^Approximate Unit Weight = 305 lbs. (138 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
D
O
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
O
F
T
H
I
S
S
Y
S
T
E
M
C
U
R
V
E
Static Pressure (in. wg)
Static Pressure (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
50
(1270)
8
1
⁄4 (210)
*36
(914)
40
(1016)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0 0.125 0.25 0.5 0.75 1 1.25 1.5 1.75 2
260
1/4
300
CFM
3875 3121 1727
BHP
0.12 0.14 0.12
Sones
8.0 7.1 7.4
365
CFM
4714 4130 3393
BHP
0.22 0.25 0.26
Sones
9.2 8.8 8.6
1/3 405
CFM
5231 4716 4095
BHP
0.30 0.33 0.35
Sones
10.4 10.3 10.3
1/2 465
CFM
6005 5570 5063 3745
BHP
0.45 0.50 0.52 0.53
Sones
11.4 10.9 10.4 9.6
3/4 520
CFM
6716 6324 5898 4869 3008
BHP
0.63 0.68 0.72 0.75 0.64
Sones
12.9 12.1 11.3 10.3 9.4
1 580
CFM
7491 7137 6775 5912 4826
BHP
0.88 0.93 0.98 1.04 1.03
Sones
14.4 13.7 13.0 12.2 11.0
1
1
⁄2 665
CFM
8588 8278 7979 7274 6474 5465 3608
BHP
1.33 1.39 1.44 1.53 1.57 1.55 1.29
Sones
16.7 16.2 15.8 15.0 14.2 13.3 12.8
2
700
CFM
9041 8746 8460 7811 7068 6227 4912
BHP
1.55 1.61 1.67 1.77 1.82 1.83 1.71
Sones
17.8 17.4 17.0 16.2 15.5 14.8 13.8
735
CFM
9493 9212 8938 8335 7649 6878 5916 4236
BHP
1.79 1.86 1.92 2.03 2.10 2.13 2.09 1.80
Sones
18.9 18.6 18.3 17.6 16.8 16.2 15.6 14.9
3
785
CFM
10138 9875 9617 9069 8452 7769 7006 5949 4189
BHP
2.18 2.26 2.33 2.44 2.53 2.58 2.59 2.49 2.11
Sones
21 20 20 19.7 18.9 18.2 17.9 17.1 16.7
835
CFM
10784 10537 10292 9794 9225 8606 7932 7157 6024 4294
BHP
2.62 2.70 2.78 2.91 3.02 3.08 3.12 3.10 2.93 2.49
Sones
23 23 22 22 21 20 19.9 19.7 18.7 18.6
MAXIMUM BHP AT A GIVEN RPM = (RPM/572)
3
MAXIMUM RPM = 835
TIP SPEED (ft/min) = RPM x 7.985
MAXIMUM MOTOR FRAME SIZE = 184T