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LB Dimensions
LBP Dimensions
1
3
⁄4
(44)
1
3
⁄4
(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 of a
birdscreen in the airstream. The sound ratings shown are loudness values in fan sones at 5 feet (1.5 m) in a hemispherical free field calculated per AMCA Standard 301. Values
shown are for installation type A: Free inlet hemispherical sones.
LB/LBP 24
Belt Drive
02468101214
0
50
100
150
200
250
300
350
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
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Static Pressure in. wg
cfm
m
3
/hr X 1000
Static Pressure Pa
1 1/2 hp
2 hp
1 hp
3/4 hp
1/2 hp
1/3 hp
1/4 hp
910
799
688
577
466
355
RPM
HP
Density 0.075 lb/ft
3
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.25 0.375 0.5 0.625 0.75 0.875 1 1.25 1.375
LB/LBP-24-4 1/4
355
CFM 3419
BHP 0.11
Sones 5.8
409
CFM 3938 2715
BHP 0.17 0.19
Sones 6.3 5.1
462
CFM 4449 3451 2491
BHP 0.24 0.28 0.25
Sones 7.4 6.3 5.3
LB/LBP-24-3 1/3 508
CFM 4892 4043 3433
BHP 0.32 0.36 0.36
Sones 8.5 7.4 6.8
LB/LBP-24-5 1/2 582
CFM 5604 4917 4441 3899
BHP 0.48 0.54 0.55 0.55
Sones 10.7 9.4 8.9 8.4
LB/LBP-24-7 3/4
625
CFM 6018 5381 4988 4497 3929
BHP 0.59 0.66 0.68 0.68 0.66
Sones 12.4 11.0 10.3 10.0 9.5
667
CFM 6423 5828 5505 5062 4589 3984
BHP 0.72 0.8 0.82 0.83 0.83 0.79
Sones 14.1 12.7 12.0 11.5 11.1 10.9
LB/LBP-24-10 1 734
CFM 7068 6531 6252 5912 5503 5073 4555
BHP 0.96 1.05 1.08 1.1 1.1 1.1 1.07
Sones 17.0 15.3 14.6 13.9 13.5 13.2 12.9
LB/LBP-24-15 1
1
⁄2 787
CFM 7578 7080 6820 6560 6190 5799 5398 4909
BHP 1.18 1.29 1.32 1.35 1.36 1.36 1.36 1.32
Sones 19.6 17.4 16.5 15.9 15.4 15.0 14.8 14.1
LB/LBP-24-20 2
868
CFM 8358 7907 7675 7440 7192 6855 6505 6141 5285
BHP 1.58 1.7 1.74 1.78 1.81 1.82 1.83 1.82 1.76
Sones 24 21 20 19.4 18.9 18.3 17.9 17.6 16.0
910
CFM 8763 8333 8114 7889 7664 7377 7056 6713 5995 5537
BHP 1.82 1.95 2 2.04 2.07 2.09 2.1 2.1 2.08 2.03
Sones 27 24 23 21 21 20 19.8 19.5 18.4 17.2
45
1
⁄2
(1156)
MAX. BHP AT A GIVEN RPM - (rpm/710)
3
MAXIMUM FRPM = 910
TIP SPEED = rpm x 6.414
MAX. MOTOR FRAME SIZE = 145T
34
(864)
51
(1295)
23
1
⁄2
(597)
20
1
⁄2
(521)
6
3
⁄4
(171)
40
(1016)
49
1
⁄2
(1257)
20
(508)
34
(864)
34
(864)
34
(864)
23
1
⁄2
(597)
LB-24 LBP-24
Hood Thickness 22 ga -
Cover Thickness - 0.064 (0.029)
Louver Thickness - 0.081 (0.036)
Curb Cap Thickness 0.064 (0.029) 0.064 (0.029)
Damper Size Square 24 (610) 24 (610)
Roof Opening Square 26
1
⁄2 (673) 26
1
⁄2 (673)
Weight*
Galvanized,
188
(85)
Aluminum,
239 (108)
All dimensions are in inches (millimeters). Weight in pounds
(kilograms). *Weight shown is the largest cataloged
Open Drip Proof motor. See page 8 for severe duty LBP
dimensions.