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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 48
Belt Drive
0 10203040
0
50
100
150
200
250
300
D
O
N
OT
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 4 8 12 16 20 24 28
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Static Pressure in. wg
cfm X 1000
m
3
/hr X 1000
Static Pressure Pa
5 hp
3 hp
2 hp
1 1/2 hp
1 hp
3/4 hp
1/2 hp
420
366
312
258
204
150
RPM
HP
Density 0.075 lb/ft
3
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 0.9 1
LB/LBP-48-5 1/2
150
CFM 9666 6546
BHP 0.21 0.24
Sones 6.1 5.4
175
CFM 11277 8948
BHP 0.34 0.38
Sones 6.9 5.6
199
CFM 12824 10846 7629
BHP 0.5 0.56 0.54
Sones 7.6 6.8 7.0
LB/LBP-48-7 3/4 226
CFM 14563 12863 10741
BHP 0.73 0.81 0.83
Sones 8.5 8.2 7.5
LB/LBP-48-10 1 249
CFM 16046 14530 12787 10092
BHP 0.98 1.07 1.1 1.08
Sones 9.5 9.4 9.2 8.3
LB/LBP-48-15 1
1
⁄2
267
CFM 17205 15823 14222 12151
BHP 1.2 1.31 1.35 1.36
Sones 10.6 10.4 10.2 9.2
285
CFM 18365 17103 15612 13896 11357
BHP 1.46 1.58 1.63 1.66 1.61
Sones 12.3 11.7 11.1 10.5 9.6
LB/LBP-48-20 2 314
CFM 20234 19141 17779 16397 14665 11934
BHP 1.96 2.1 2.17 2.2 2.22 2.1
Sones 15.4 14.5 13.4 12.5 12.2 11.5
LB/LBP-48-30 3 359
CFM 23134 22214 21041 19878 18650 17134 15069 11596
BHP 2.93 3.1 3.21 3.25 3.29 3.31 3.25 2.84
Sones 18.4 17.8 17.2 16.5 15.9 15.5 14.8 13.4
LB/LBP-48-50 5
381
CFM 24552 23685 22620 21512 20378 19104 17564 15491 15076
BHP 3.5 3.68 3.81 3.87 3.92 3.95 3.95 3.86 3.85
Sones 20 19.6 19.1 18.6 17.9 17.4 17.1 16.2 16.0
420
CFM 27065 26278 25383 24354 23363 22317 21159 19839 19534 18029
BHP 4.69 4.89 5.05 5.15 5.21 5.25 5.29 5.31 5.3 5.23
Sones 23 23 23 23 22 22 21 21 21 20
MAX. BHP AT A GIVEN RPM - (rpm/241)
3
MAXIMUM FRPM = 420
TIP SPEED = rpm x 12.632
MAX. MOTOR FRAME SIZE = 213T
70
3
⁄8
(1788)
58
(1473)
87
(2210)
41
1
⁄2
(1054)
41
(1041)
11
5
⁄8
(295)
64
(1626)
76
1
⁄2
(1943)
32
(813)
58
(1473)
58
(1473)
58
(1473)
40
3
⁄8
(1026)
LB-48 LBP-48
Hood Thickness 0.064 (0.029) -
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 48 (1219) 48 (1219)
Roof Opening Square 50
1
⁄2 (1283) 50
1
⁄2 (1283)
Weight*
Galvanized,
430
(195)
Aluminum,
579 (263)
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.