Greenheck Series L User manual

Centrifugal Roof Exhaust Fans
Series L
Low Silhouette
April
2008
Louvered Penthouse Style
LDP/LBP
Fabra Hood Style
LD/LB

2
Series L
Centrifugal Roof Exhaust Fans
Greenheck’s Series L, low silhouette, models LD, LB, LDP, and LBP centrifugal roof exhaust fans provide the
industry’s best performance and durability for general clean air applications.
• Broadest performance in the industry, up to 1.25 in. wg (311 Pa) and 37,500 cfm (63,713 m3/hr).
• Performance as cataloged is assured. All fan sizes are tested in our AMCA Accredited Laboratory, and all
models are licensed to bear the AMCA sound and air performance seals.
• UL Listed for electrical.*
• Greenheck subjects these products to extensive life testing, assuring you the fans will provide years of
reliable performance.
Greenheck Fan Corporation certifies the
models LD, LDP, LB, and LBP shown
herein are licensed to bear the AMCA seal.
The ratings shown are based on tests
and procedures performed in accordance
with AMCA Publication 211 and AMCA
Publication 311 and comply with the
requirements of the AMCA Certified
Ratings Program.
* UL is optional and must be specified.
Models LD, LDP, LB, and LBP are
listed for electrical (UL/cUL 705)
File no. E40001.
World Class Manufacturing
Greenheck’s skilled production workers use cost-effective machines and unique dies designed and built by our
own engineers to add innovative features and greater strength to our centrifugal roof exhaust fans. Our advanced
manufacturing processes and quality control procedures always ensure the highest product quality. And just to
be sure you get the peace-of-mind you expect when you specify Greenheck, our assembly inspectors test run
and monitor every fan before it leaves the factory. Results of these tests are kept in permanent records for future
reference.
Quick Build Programs
Our Quick Build (QB) Program ensures rapid response time when your
needs require a fast turnaround. Select from more than 40 configurations
of the Series L, low silhouette model fan and we will manufacture and ship
them within ten days. We have strategically located many warehouses
across the United States and internationally to fill your request at a
moments notice.
Leading Edge Technical Support
When you need extensive product or installation and operating manual (IOM)
information, our products are supported by the industry’s best product literature,
electronic media and computer aided product selection (CAPS) program. You’ll
also find this information on our website at www.greenheck.com
You can always count on personal service and expertise from our national and
international representative organization. To locate your nearest Greenheck
representative, call 715-359-6171 or visit our website at www.greenheck.com

3
Unique Construction Features
Louvered Penthouse
S
t
y
le
•
Hinged
C
over
-
All
si
z
es
fea
t
u
r
e
a
n
a
l
um
i
num cover w
hi
c
h
ma
y
b
e
hi
n
g
e
d
to
p
rovide quick access to the motor an
d
d
rive assembly.
C
overs are fastened down
w
i
t
h
a
q
u
i
c
k
re
l
ease
h
oo
d
l
atc
h.
•
Lar
g
e Interior Dimensions
-
All
s
iz
es
a
ll
o
w
c
omp
l
ete access
ibili
ty
f
rom a
b
ove.
I
nter
i
o
r
di
mens
i
ons o
ff
er c
l
earance
f
or
i
ns
p
ect
i
on,
c
leanin
g
, or maintenance of the motor,
wheel, belt
(
s
)
, and drives.
•
Stren
g
th & Weather Resistant -
E
ac
h
un
i
t
fea
t
u
r
es
s
t
o
rm r
es
i
s
t
a
nt
a
l
u
min
u
m l
ou
v
e
r
bl
a
d
es w
i
t
h
m
i
tere
d
corners.
F
or
d
eca
d
es
,
o
ur storm res
i
stant
bl
a
d
es
h
ave
p
roven
hi
g
hl
y
effective. Each sturd
y
extruded
alu
m
i
n
u
m
lou
v
e
r
blade
has
a
m
a
t
e
r
ial
thi
c
k
ness o
f
0
.
080
i
nc
h
e
s.
G
reenheck’s louvered
p
enthouse hoods feature
h
eavy gauge extru
d
e
d
aluminum louvers
with mit
e
r
ed
co
rn
e
r
s
f
or a c
l
ean,
fi
n
i
s
h
e
d
appearance and weather
r
es
i
s
t
a
nt
co
n
s
tr
uc
ti
o
n
.
Th
e
i
nter
i
or vert
i
ca
l
e
d
ge o
f
t
h
e cur
b
cap
f
orms t
h
e t
h
roat an
d
weat
h
ers
hi
e
ld
.
E
ac
h
c
orner is also shielded to prevent leaka
g
e.
P
ent
h
ouses are ava
il
a
bl
e
i
n a
l
um
i
num
f
or
l
astin
g
durabili
ty
and a
pp
earance.
F
abra Hood
S
t
y
l
e
•
Hi
nge
d
H
oo
d
-
All
s
i
zes
f
eature a
h
oo
d
w
hich ma
y
be hin
g
ed to provide quic
k
a
ccess to the motor and drive assembl
y
.
A
ccess may
b
e ga
i
ne
d
b
y s
i
mp
l
y remov
i
ng
two of the four hood fasteners or all
fasteners for complete removal
.
•
L
arge
I
nter
i
or
Di
mens
i
ons
-
All
s
i
zes a
ll
ow
complete accessibilit
y
. Interior dimension
s
offer clearance for inspection, cleanin
g
, or
maintenance of the motor, wheel, belt
(
s
)
,
a
nd drives
.
• Stren
g
th & Weather Resistance - Th
e
h
oo
d
i
s
d
es
i
gne
d
w
i
t
h
arc
h
e
d
pane
l
s
manu
f
acture
d
o
f
h
eav
y
g
au
g
e, prec
i
s
i
on ro
ll
formed steel with interlockin
g
ed
g
es. Each
i
nter
l
oc
ki
ng r
ib
creates a t
i
g
h
t, weat
h
er
res
i
stant sea
l
.
H
eav
y
g
au
g
e stee
l
support
members provide structural stren
g
th. The
fi
rst
h
oo
d
was
p
ut
i
nto serv
i
ce over
30
y
ears a
g
o.
Greenheck’s interlockin
g
rib desi
g
n combines
four material thicknesses with I-beam design
pr
i
nc
i
p
l
es pro
d
uc
i
ng a
h
oo
d
f
ar super
i
o
r
in stren
g
th to
co
nv
e
nti
o
n
a
l
designs
(
an
important feature
in high wind
a
n
d
snow
l
oa
d
re
g
ions)
.
Fo
rm
ed
c
h
a
nn
e
l
s
adj
acent to t
h
e r
ib
s prov
id
e water
d
ra
i
nage to
ensure weather ti
g
htness.
Hoods are available in
g
alvanized steel,
pa
i
nte
d
stee
l
, or a
l
um
i
num construct
i
on
.

4
1
2
5
6
8
9
10
11
12
13
14
15
3
4
7
5
10
11
6
9
13
LBP/LDP
LOUVERED PENTHOUSE STYLE
LB/LD
FABRA HOOD STYLE

5
Unique Construction Features
STANDARD INSTALLATION
Models LB, LD, LBP, and LDP exhaust fans are designed
to meet the needs of general clean air applications. Tests
have been conducted to ensure safe and reliable fans
capable of withstanding normal exhaust conditions.
When roofing materials extend to the top of the curb,
roof curbs should be 11⁄2in. (38 mm) (3/4 in. (19 mm)
on a side) less than the unit curb cap to allow for
roofing and flashing.
For recommended duct size, damper size, and
roof opening dimensions, refer to CAPS or the
performance data pages.
Installation must include a means for inspecting,
cleaning, and servicing the exhaust fan.
Due to the varying airstreams encountered in
commercial ventilation, system designers must
be aware of national, state, and local codes and
guidelines governing these installations. Local code
authorities should be consulted before proceeding
with any ventilation project.
Recommended
Duct and
Damper Size
Recommended
Roof Opening
1 1/4 in.
(32 mm)
3/4 in.
(19 mm)
Damper
8 to 12 in.
(203 to 305 mm)
1 1/4 in.
(32 mm)
FABRA HOOD STYLE - Models LD and LB have
a rib-lock aluminum housing. Hood panels are
interlocked and attached to sturdy aluminum
rails. (Galvanized housings are optional).
HINGED ACCESS - The entire hood assembly
on models LD and LB can be hinged open for
access to the internal fan components.
LOUVERED PENTHOUSE - Models LDP and
LBP penthouse style housings are constructed
of heavy extruded aluminum louvers with
mitered and welded corners.
HOOD COVER - Models LDP and LBP
aluminum hood covers are hinged and
removable for access.
DRIVE FRAME - Constructed from heavy
gauge galvanized steel. Belt adjustment is
accomplished by loosening fasteners, sliding
the motor plate, and retightening fasteners.
FAN SHAFT - Precisely sized, ground, and
polished so the first critical speed is at least
25% over the maximum operating speed. Close
tolerances between the shaft and bearing result
in longer bearing life.
BEARINGS - 100% factory tested and designed
specifically for air handling applications with
a minimum L10 life in excess of 100,000 hours
(L50 average life of 500,000 hours).
CURB CAP - Curb cap has prepunched
mounting holes to ensure correct attachment to
the curb.
MOTOR - Permanently lubricated, sealed ball
bearing motors are selected to provide years of
trouble-free operation.
DRIVE ASSEMBLY - Drives are oversized 150%
of driven horsepower. Machined cast iron
pulleys are factory set to the required RPM and
are adjustable for final system balancing. Belts
are static free and oil resistant.
WHEEL - An aluminum, backward inclined,
non-overloading, centrifugal wheel is utilized
to deliver maximum efficiency. Each wheel is
statically and dynamically balanced.
VIBRATION ISOLATORS - Support the drive
assembly and wheel without steel to steel
contact providing long life and quiet operation.
BIRDSCREEN - Galvanized rigid wire protects
the fan’s discharge from birds or small objects.
(Aluminum birdscreen is optional).
WINDBAND - Lower windband assembly
ensures weathertight and rigid unit
construction.
DISCONNECT SWITCH - NEMA-1 switch is
factory mounted and wiring is provided from
the motor to the disconnect enclosure as
standard. All wiring and electrical components
comply with the National Electric Codes (NEC)
and are UL Listed or Recognized.
CONDUIT CHASE - A large diameter conduit for
installing electrical wiring through the curb cap
into the motor compartment. (Not shown)
1
2
3
4
5
6
7
8
10
9
11
12
13
14
15
16

6
Options and Accessories
BIRDSCREEN - Galvanized mesh is standard.
Optional aluminum or stainless steel rigid wire are
also available.
HOOD INSULATION - Hood insulation is dual-
density to minimize condensation, reduce thermal
transfer, and enhance sound absorption at high and
low frequencies.
LIFTING LUGS - Four heavy gauge steel brackets
are available to provide lifting points when raising
the fan to the roof.
TIE DOWN POINTS - Four heavy gauge steel
brackets are available to secure the fan in heavy
wind applications. Cables and anchors by others.
COATINGS - All Greenheck coatings and resistance
charts can be found in the performance coatings
catalog. A wide variety of coatings and colors are
available in two categories:
Decorative coatings – Sixteen standard colors
are available.
Protective coatings – Five electrostatic applied
powder coatings are available to protect against
most environments.
DAMPERS - Designed to prevent
outside air from entering back
into the building when fan is
off. Options include gravity and
motorized dampers. Damper
sizes are shown on each
performance data page.
CURB SEAL - Rubber seal between fan and curb to
ensure proper sealing when attached to a curb.
DISCONNECT SWITCHES - A wide selection
of NEMA rated switches are
available for positive electrical
shutoff and safety, including:
dust-tight, rainproof, and
corrosion-resistant. Switches
may be internally or externally
mounted.
SPEED CONTROLLERS - Available for use with
shaded pole and permanent split capacitor (PSC)
open motors on models LD and LDP fans. They
provide an economical means of system balancing
with direct drive fans.
CURB EXTENSIONS - Extensions raise the fan
discharge above the roof line and provide an
accessible mounting location for dampers. Insect
screen bases
constructed with
a removable
fine mesh are
recommended for
applications where insect
entry must be prevented. Curb
extensions are not available with LDP and LBP
severe duty construction models.
ROOF CURBS - Prefabricated roof curbs reduce
installation time and costs by ensuring compatibility
between the fan, curb, and roof opening. All curbs
are insulated with fiberglass. A
wide variety of roof curbs
are available including
flanged, pitched, and
sound-absorbing.

7
Severe Duty Installation
Models LDP and LBP severe duty exhaust fans are designed to meet the needs of general clean air
applications. Tests have been conducted to ensure safe, rugged and reliable fans capable of withstanding
severe exhaust conditions.
The severe duty roof curb model SD is supplied
with this product and is designed with 12 gauge
welded steel construction. Greenheck
recommends the severe duty curb to be
anchored to the structure of the building.
Dependent upon roofing material it shall be
bolted and welded. For recommended duct
size, refer to CAPS or installation manual.
Installation must include a means for
inspecting, cleaning, and servicing the
exhaust fan.
Due to the varying airstreams encountered
in commercial ventilation, system designers
must be aware of national, state, and local
codes and guidelines governing these
installations. Local code authorities should
be consulted before proceeding with any
ventilation project.
Severe Duty Option
SEVERE DUTY - Specifically designed for applications with
extremely high structural design load requirements. The severe
duty models LDP and LBP are far superior to any centrifugal roof
exhaust fan currently in the market. Designed with structural steel
supports and ESD-603D louver blades, the severe duty louver
enclosure (SDLE) may be used in any application which requires a
fan to endure high winds with the potential of wind blown debris.
The louvered housing has been tested in accordance with the
following Miami-Dade test protocols:
• Large Missile Impact Test - TAS-201-94
• Uniform Static Air Pressure - TAS-202-94
• Uniform Cyclic Wind Loading - TAS-203-94
To meet the above protocols, the severe duty fan must be mounted
on a severe duty roof curb, which is attached directly to the building
structure. Maximum design load is 140 psf.
Available on sizes
• LDP - 60 though 120
• LBP - 10 through 30
Weights and dimensions will vary from standard LDP and LBP construction.
NOTICE OF ACCEPTANCE NUMBER 03-0422.05
OUTSIDE CURB DIMENSION
ROOF OPENING
12, 18 OR 24 INCHES
(305, 457, 610 MM)
THROAT DIMENSION
(ROOF OPENING)
1 INCH (25 MM) INSULATION
6 INCH x 3 INCH
(152 MM x 76 MM)
STEEL MOUNTING ANGLE
(12 GAUGE MINIMUM)
RECOMMENDED
DUCT & DAMPER SIZE
1 1/4 INCH (32 MM)
4 IN.
(102 MM)
1 3/4 INCH (44 MM)
3/4 INCH (19 MM)
4 IN.
(102 MM)
4 INCH
(102 MM) 4 INCH
(102 MM)
1 3/4 INCH
(44 MM)
2 1/2 INCH (64 MM)
2 1/2 INCH (64 MM)
1 3/4 INCH (44 MM)
CONCRETE ROOF TRUSS
CORRUGATED
ROOF DECK

8
Severe Duty Dimensions
LDP - SEVERE DUTY DIMENSIONS
LBP - SEVERE DUTY DIMENSIONS
AA
D
CB
E
A
A
D
C
B
E
Model
Number ABCDE
Damper
Size
(square)
Roof
Opening
(square)
Weight* Cover
Thickness
Louver
Thickness
Curb Cap
Thickness
LDP
60
17
(432)
347⁄8
(886)
347⁄8
(886)
175⁄8
(448)
13⁄4
(44)
8
(203)
101⁄2
(267)
375
(170)
0.100
(0.045)
aluminum
0.125
(0.056)
aluminum
0.25
(0.113)
steel
65
70
75
80
19
(483)
367⁄8
(934)
367⁄8
(934)
175⁄8
(448)
13⁄4
(44)
10
(254)
121⁄2
(318)
400
(181)
85
90
95
100 22
(559)
397⁄8
(1013)
397⁄8
(1013)
195⁄8
(498)
13⁄4
(44)
12
(305)
141⁄2
(368)
425
(193)
120
LBP
10 22
(559)
397⁄8
(1013)
503⁄8
(1280)
181⁄8
(460)
13⁄4
(44)
12
(305)
101⁄2
(267)
550
(249)
0.100
(0.045)
aluminum
0.125
(0.056)
aluminum
0.25
(0.113)
steel
14 26
(660)
437⁄8
(1114)
517⁄8
(1318)
181⁄8
(460)
13⁄4
(44)
16
(406)
101⁄2
(267)
550
(249)
18 30
(762)
477⁄8
(1216)
577⁄8
(1470)
245⁄8
(625)
13⁄4
(44)
18
(457)
101⁄2
(267)
550
(249)
21 101⁄2
(267)
700
(318)
24 34
(864)
517⁄8
(1318)
617⁄8
(1572)
245⁄8
(625)
13⁄4
(44)
24
(610)
101⁄2
(267)
800
(363)
30 40
(1016)
577⁄8
(1470)
697⁄8
(1775)
271⁄4
(692)
13⁄4
(44)
30
(762)
101⁄2
(267)
950
(431)
All dimensions are in inches (millimeters). Weight in pounds (kilograms). *Weight shown is the largest cataloged Open Drip Proof motor.

9
Model Number Code
The Model number system is designed to completely identify the fan. The correct code letters must be
specified to designate belt or direct drive. The remainder of the model number is determined by the size and
performance selected from the following pages.
LB - 30 - 7
Motor hp (Belt Drive only)
6= 1/6 10 = 1 50 = 5
4= 1/4 15 = 11⁄275 = 71⁄2
3= 1/3 20 = 2 100 = 10
5= 1/2 30 = 3 150 = 15
7= 3/4
Motor RPM (Direct Drive only)
A= 1725
B= 1140
C= 860
Model
LD - Fabra Hood Direct Drive
LB - Fabra Hood Belt Drive
LDP - Louvered Penthouse Direct Drive
LBP - Louvered Penthouse Belt Drive
Fan Size
LD/LDP 60 thru 120
LB/LBP 10 thru 54
9
OUTSIDE CURB DIMENSION
ROOF OPENING
2.5 INCH (57 MM)
EMBEDMENT
CURB HEIGHT
12, 18, OR 24 INCHES
(305, 457, or 610 MM)
THROAT DIMENSION AND ROOF OPENING EQUAL OUTSIDE CURB DIMENSION MINUS 3.5 INCHES (89 MM)
MINIMUM CONCRETE
STRENGTH OF 3000 PSI
THROAT DIMENSION
(ROOF OPENING)
4 INCH (102 MM) TYPICAL
1.75 INCH (44 MM) 1.75 INCH (44 MM)
1.75 INCH (44 MM)
1 INCH (25 MM) INSULATION
2.25 INCH (57 MM) TYPICAL
4 INCH (102 MM)
MOUNTING FLANGE
TYPICAL
HILTI KB11, 3/8-16 X 3 ON
12 INCH (305 MM) MAXIMUM CENTERS.
MINIMUM TWO PER SIDE.
OUTSIDE FLANGE DIMENSION
OUTSIDE CURB DIMENSION
ROOF OPENING
CURB HEIGHT
12, 18, OR 24 INCHES
(305, 457, 610 MM)
THROAT DIMENSION
(ROOF OPENING)
6 X 3 INCH (152 x 76 mm)
STEEL MOUNTING ANGLE
(12 GAUGE MINIMUM)
ROOF TRUSS
CORRUGATED
ROOF DECK
HILTI KWIK-FLEX 12-14 SCREW, NO. 3 POINT.
THREE (3) FASTENERS EACH CORNER AND
MAXIMUM OF 4.5 INCHES (114 mm) SPACING;
ADD ADDITIONAL FASTENERS TO SATISFY.
4 INCH (102 MM)
MOUNTING FLANGE
TYPICAL
CORNER TOP VIEW
4 INCH (102 MM) TYPICAL
1.75 INCH (44 MM) 1.75 INCH (44 MM)
1.75 INCH (44 MM)
1 INCH (25 MM) INSULATION
2.25 INCH (57 MM) TYPICAL
THROAT DIMENSION AND ROOF OPENING EQUAL OUTSIDE CURB DIMENSION MINUS 3.5 INCHES (89 MM)
OUTSIDE FLANGE DIMENSION
Concrete
Steel
Severe Duty Curb
Installation Options

10
LD Dimensions
LDP Dimensions
13⁄4
(44)
13⁄4
(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.
LD/LDP 60-75
Direct Drive
Model
Number
Motor
HP
Fan
RPM Watts CFM / Static Pressure in Inches wg
0 0.1 0.125 0.2 0.25 0.3 0.375 0.4 0.45 0.5
LD/LDP-60 1/60 1590* 51 W CFM 202 171 164 139 119 97
Sones 4.8 4.3 4.3 4.0 3.8 3.6
LD/LDP-65 1/30 1680* 70 W CFM 274 245 238 208 187 165 129 112
Sones 5.6 5.3 5.2 5.0 5.1 5.1 5.1 5.2
LD/LDP-70 1/30 1665* 73 W CFM 360 324 314 282 257 231 188 171 132
Sones 6.4 6.0 5.9 5.5 5.4 5.3 5.2 5.1 5.0
LD/LDP-75 1/25 1620* 79 W CFM 400 360 351 317 290 264 222 206 168 122
Sones 5.8 5.2 5.1 4.9 4.7 4.5 4.2 4.1 4.0 3.8
17
(432)
131⁄2
(343)
17
(432)
22
(559)
27
(686)
13
(330)
2
(51)
17
(432)
17
(432)
23
(584)
23
(584)
111⁄2
(292)
0 50 100 150 200 250 300 350 400 450 500
0
20
40
60
80
100
120
140
0 50 100 150 200 250 300
0.0
0.1
0.2
0.3
0.4
0.5
0.6
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
Size 60 and 65
RPM
Density 0.075 lb/ft3
LD/LDP-60
LD/LDP-65
131⁄2
(343)
0 100 200 300 400 500 600
0
20
40
60
80
100
120
140
0 50 100 150 200 250 300 350 400
0.0
0.1
0.2
0.3
0.4
0.5
0.6
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
Size 70 and 75
RPM
Density 0.075 lb/ft3
LD/LDP-70
LD/LDP-75
LD 60 thru LD 75 LDP 60 thru LDP 75
Hood Thickness 24 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 8 (203) 8 (203)
Roof Opening Square 101⁄2(267) 101⁄2(267)
Weight* Galvanized, 37 (17) Aluminum, 49 (22)
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 LDP dimensions.

11
LD Dimensions
LDP Dimensions
13⁄4
(44)
13⁄4
(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.
LD/LDP 80-95
Direct Drive
Model
Number
Motor
HP
Fan
RPM Watts CFM / Static Pressure in Inches wg
0 0.1 0.125 0.2 0.25 0.3 0.375 0.5 0.6 0.625
LD/LDP-80 1/20 1550* 115 W CFM 481 426 413 372 342 310 258 165
Sones 8.8 8.2 8.0 7.8 7.6 7.4 7.2 7.5
LD/LDP-85 1/20 1500* 120 W CFM 576 507 490 440 403 360 291 182
Sones 8.6 8.1 8.0 7.7 7.3 7.1 7.0 7.8
LD/LDP-90 1/15 1550* 92 W CFM 819 735 714 654 608 562 485 361
Sones 8.8 8.6 8.5 8.4 8.3 8.1 7.8 7.9
LD/LDP-95 1/8 1550* 160 W CFM 1052 965 942 870 825 780 695 552 430 396
Sones 11.8 11.2 11.1 10.8 10.4 10.2 10.0 9.8 10.1 10.2
19
(483)
131⁄2
(343)
19
(483)
28
(711)
27
(686)
16
(406)
4
(102)
19
(483)
19
(483)
25
(635)
25
(635)
121⁄2
(318)
0 200 400 600 800 1000
0
20
40
60
80
100
120
140
160
0 100 200 300 400 500 600
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
Size 80 and 85
LD/LDP-80
RPM
Density 0.075 lb/ft3
LD/LDP-85
0 200 400 600 800 1000 1200 1400 1600 1800 2000
0
20
40
60
80
100
120
140
160
180
200
220
0 200 400 600 800 1000 1200
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
LD/LDP-90
Size 90 and 95
RPM
Density 0.075 lb/ft3
LD/LDP-95
161⁄2
(419)
LD 80 thru LD 95 LDP 80 thru LDP 95
Hood Thickness 24 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 10 (254) 10 (254)
Roof Opening Square 121⁄2(318) 121⁄2(318)
Weight* Galvanized, 45 (20) Aluminum, 63 (29)
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 LDP dimensions.

12
LD Dimensions
LDP Dimensions
13⁄4
(44)
13⁄4
(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.
0 500 1000 1500 2000 2500
0
50
100
150
200
250
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
0 200 400 600 800 1000 1200 1400 1600
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
RPM
Density 0.075 lb/ft3
Size 100
1725
1140
860
0 500 1000 1500 2000 2500 3000
0
50
100
150
200
250
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
0 200 400 600 800 1000 1200 1400 1600 1800 2000
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
Size 120
RPM
Density 0.075 lb/ft3
1725
1140
860
LD/LDP 100-120
Direct Drive
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.125 0.2 0.25 0.375 0.5 0.625 0.75 0.875 0.9
LD/LDP-100-C 1/8 860
CFM 766 568 407
BHP 0.022 0.029 0.028
Sones 6.3 5.3 5.1
LD/LDP-100-B 1/6 1140
CFM 1016 879 780 709 493
BHP 0.051 0.065 0.068 0.068 0.066
Sones 12.0 11.0 10.6 10.4 10.4
LD/LDP-100-A 1/4 1725
CFM 1538 1457 1399 1360 1256 1142 1024 891 724 678
BHP 0.18 0.21 0.22 0.22 0.23 0.24 0.24 0.23 0.23 0.22
Sones 16.2 14.8 14.4 14.2 14.3 14.2 14.8 15.3 15.9 16.1
LD/LDP-120-C 1/8 860
CFM 921 702 536
BHP 0.03 0.041 0.043
Sones 6.6 5.3 5.1
LD/LDP-120-B 1/6 1140
CFM 1221 1072 960 886 664
BHP 0.071 0.086 0.094 0.096 0.099
Sones 11.9 10.9 10.3 10.0 9.2
LD/LDP-120-A 1/4 1725
CFM 1848 1762 1693 1652 1540 1412 1286 1142 979 940
BHP 0.25 0.28 0.29 0.29 0.31 0.33 0.34 0.35 0.34 0.33
Sones 21 19.6 19.4 19.3 18.6 18.4 18.2 18.2 18.3 18.3
22
(559)
131⁄2
(343)
22
(559)
30
(762)
27
(686)
18
(457)
4
(102)
22
(559)
22
(559)
28
(711)
28
(711)
181⁄2
(470)
14
(356)
LD 100 thru LD 120 LDP 100 thru LDP 120
Hood Thickness 24 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 12 (305) 12 (305)
Roof Opening Square 141⁄2(368) 141⁄2(368)
Weight* Galvanized, 57 (26) Aluminum, 82 (37)
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 LDP dimensions.

13
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 10
Belt Drive
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 1 1.125
LB/LBP-10-4 1/4
600
CFM 539 351
BHP 0.013 0.014
Sones 3.0 1.6
712
CFM 639 500
BHP 0.021 0.024
Sones 3.6 2.3
937
CFM 841 746 623
BHP 0.048 0.053 0.054
Sones 5.1 4.3 3.6
1049
CFM 942 855 759 625
BHP 0.067 0.073 0.076 0.075
Sones 5.9 5.3 4.7 4.2
1162
CFM 1043 963 887 780 618
BHP 0.091 0.097 0.103 0.103 0.099
Sones 6.9 6.3 5.9 5.4 4.7
1274
CFM 1144 1070 1004 917 818
BHP 0.12 0.13 0.13 0.14 0.14
Sones 8.0 7.5 7.1 6.8 6.3
1386
CFM 1244 1177 1114 1047 953 861
BHP 0.15 0.16 0.17 0.18 0.18 0.17
Sones 9.2 8.8 8.4 8.2 7.9 7.3
1499
CFM 1346 1283 1224 1168 1093 1006 910
BHP 0.19 0.2 0.21 0.22 0.22 0.22 0.22
Sones 10.0 9.8 9.5 9.3 8.8 8.3 7.8
1611
CFM 1446 1388 1331 1280 1220 1142 1064 970
BHP 0.24 0.25 0.26 0.27 0.28 0.28 0.28 0.27
Sones 11.2 10.9 10.7 10.4 10.1 9.5 9.0 8.5
LB/LBP-10-3 1/3
1689
CFM 1516 1461 1406 1356 1304 1237 1158 1087 980
BHP 0.28 0.29 0.3 0.31 0.32 0.32 0.32 0.32 0.31
Sones 12.2 11.9 11.6 11.3 11.0 10.6 9.9 9.5 8.9
1767
CFM 1587 1533 1480 1432 1385 1327 1254 1182 1112 997
BHP 0.32 0.33 0.34 0.35 0.36 0.36 0.36 0.36 0.36 0.36
Sones 13.5 13.0 12.6 12.2 11.9 11.7 11.0 10.5 10.1 9.5
MAX. BHP AT A GIVEN RPM - (rpm/2476)3
MAXIMUM FRPM = 1767
TIP SPEED = rpm x 2.913
MAX. MOTOR FRAME SIZE = 56
28
(711)
22
(559)
39
(991)
17
(432)
22
(559)
22
(559)
28
(711)
381⁄2
(978)
171⁄4
(438)
31⁄4
(85)
17
(432)
14
(356)
325⁄8
(829)
0 500 1000 1500 2000 2500
0
50
100
150
200
250
300
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
0 200 400 600 800 1000 1200 1400 1600
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
RPM
HP
Density 0.075 lb/ft3
1/4 hp
1767
1/3 hp
1534
1300
1067
833
600
LB-10 LBP-10
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 12 (305) 12 (305)
Roof Opening Square 141⁄2(368) 141⁄2(368)
Weight* Galvanized,
56 (25)
Aluminum,
99 (45)
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.

14
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 14
Belt Drive
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 1 1.125
LB/LBP-14-4 1/4
480
CFM 903 614
BHP 0.022 0.025
Sones 4.1 3.2
564
CFM 1061 848
BHP 0.035 0.041
Sones 4.7 4.2
731
CFM 1375 1231 1024
BHP 0.077 0.086 0.089
Sones 5.9 5.6 5.1
815
CFM 1533 1402 1241 1013
BHP 0.11 0.12 0.12 0.12
Sones 6.7 6.4 5.9 5.4
899
CFM 1690 1574 1439 1264 946
BHP 0.14 0.15 0.16 0.17 0.15
Sones 7.5 7.3 6.9 6.4 5.7
982
CFM 1847 1743 1629 1482 1297
BHP 0.19 0.2 0.21 0.21 0.21
Sones 8.5 8.4 8 7.5 7
1066
CFM 2004 1912 1807 1681 1534 1351
BHP 0.24 0.25 0.26 0.27 0.28 0.27
Sones 9.8 9.7 9.4 8.9 8.4 7.8
LB/LBP-14-3 1/3
1118
CFM 2102 2016 1913 1801 1672 1512 1257
BHP 0.27 0.28 0.3 0.31 0.32 0.32 0.3
Sones 10.7 10.6 10.3 9.8 9.3 8.7 8.1
1170
CFM 2200 2120 2019 1920 1797 1657 1487
BHP 0.31 0.32 0.34 0.36 0.36 0.36 0.36
Sones 11.5 11.3 11.1 10.6 10.1 9.5 9.0
LB/LBP-14-5 1/2
1257
CFM 2364 2290 2197 2112 2002 1887 1748 1585
BHP 0.39 0.4 0.42 0.44 0.44 0.45 0.45 0.44
Sones 12.9 12.7 12.5 12.1 11.6 11.1 10.5 10.1
1343
CFM 2525 2456 2372 2289 2199 2092 1979 1848 1692 1386
BHP 0.47 0.49 0.51 0.53 0.54 0.55 0.55 0.55 0.54 0.51
Sones 14.4 14.1 13.8 13.5 13.1 12.6 12.2 11.6 11.1 10.4
MAX. BHP AT A GIVEN RPM - (rpm/1639)3
MAXIMUM FRPM = 1343
TIP SPEED = rpm x 3.829
MAX. MOTOR FRAME SIZE = 56
0 1000 2000 3000 4000
0
50
100
150
200
250
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
0 300 600 900 1200 1500 1800 2100 2400 2700
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Static Pressure in. wg
cfm
m3/hr
Static Pressure Pa
RPM
HP
Density 0.075 lb/ft3
1343
1170
997
825
652
480
1/3 hp
1/4 hp
1/2 hp
35
(889)
26
(660)
39
(991)
18
(457)
26
(660)
171⁄2
(445)
4
(102)
26
(660)
32
(813)
40
(1016)
17
(432)
16
(406)
26
(660)
LB-14 LBP-14
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 16 (406) 16 (406)
Roof Opening Square 181⁄2(470) 181⁄2(470)
Weight* Galvanized,
81 (37)
Aluminum,
116 (53)
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.

15
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 18
Belt Drive
0246810
0
200
400
600
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
0.0
0.5
1.0
1.5
2.0
2.5
Static Pressure in. wg
cfm
m3/hr X 1000
Static Pressure Pa
1/4 hp
1/3 hp
1/2 hp
3/4 hp
1 hp
1 1/2 hp
2 hp
1460
RPM
HP
Density 0.075 lb/ft3
1261
1062
863
664
465
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.125 0.25 0.5 0.75 1 1.25 1.5 1.75 2
LB/LBP-18-4 1/4
465
CFM 1753 1422
BHP 0.056 0.064
Sones 3.6 2.7
562
CFM 2119 1871 1522
BHP 0.099 0.108 0.114
Sones 4.9 4.1 3.4
755
CFM 2847 2671 2474 1925
BHP 0.24 0.25 0.27 0.27
Sones 8.7 7.9 7.4 6.5
LB/LBP-18-3 1/3 826
CFM 3115 2957 2778 2324
BHP 0.31 0.33 0.34 0.36
Sones 10.2 9.5 8.9 8.0
LB/LBP-18-5 1/2
888
CFM 3348 3203 3039 2638 2110
BHP 0.39 0.4 0.42 0.45 0.44
Sones 11.7 11.0 10.4 9.4 8.7
949
CFM 3578 3442 3292 2936 2498
BHP 0.48 0.49 0.51 0.54 0.55
Sones 13.4 13.0 12.0 11.0 10.3
LB/LBP-18-7 3/4 1085
CFM 4091 3972 3847 3575 3218 2822
BHP 0.71 0.73 0.75 0.79 0.82 0.82
Sones 16.8 16.2 15.5 14.6 13.4 12.9
LB/LBP-18-10 1 1141
CFM 4302 4189 4073 3814 3493 3140 2674
BHP 0.83 0.84 0.86 0.91 0.94 0.96 0.93
Sones 18.0 17.3 16.7 15.9 14.8 14.1 13.8
LB/LBP-18-15 11⁄2
1286
CFM 4849 4749 4648 4423 4183 3880 3568 3208
BHP 1.19 1.2 1.22 1.27 1.32 1.35 1.37 1.35
Sones 21 20 19.8 19.2 18.5 17.8 17.4 17.1
1375
CFM 5185 5091 4997 4790 4576 4311 4025 3719 3382
BHP 1.45 1.47 1.49 1.54 1.59 1.63 1.66 1.67 1.65
Sones 24 23 22 21 21 20 19.9 19.6 19.5
LB/LBP-18-20 2 1460
CFM 5505 5417 5328 5138 4936 4714 4446 4176 3874 3538
BHP 1.73 1.76 1.78 1.83 1.88 1.93 1.98 2 2 1.97
Sones 26 25 24 23 23 22 22 22 22 22
MAX. BHP AT A GIVEN RPM - (rpm/1157)3
MAXIMUM FRPM = 1460
TIP SPEED = rpm x 4.843
MAX. MOTOR FRAME SIZE = 145T
30
(762)
39
(991)
21
(533)
171⁄2
(445)
41⁄2
(114)
36
(914)
46
(1168)
241⁄2
(622)
19
(483)
40
(1016)
30
(762)
30
(762) 30
(762)
LB-18 LBP-18
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 18 (457) 18 (457)
Roof Opening Square 201⁄2(521) 201⁄2(521)
Weight* Galvanized,
135 (61)
Aluminum,
179 (81)
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.

16
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 21
Belt Drive
0 2 4 6 8 10 12
0
100
200
300
400
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
0.0
0.5
1.0
1.5
2.0
Static Pressure in. wg
cfm
m3/hr X 1000
Static Pressure Pa
1200
1053
906
612
465
1 1/2 hp
1/4 hp
1/3 hp
1/2 hp
3/4 hp
1 hp
2 hp
RPM
HP
Density 0.075 lb/ft3
759
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.25 0.375 0.5 0.625 0.75 1 1.25 1.5 1.75
LB/LBP-21-4 1/4
465
CFM 2820 1732
BHP 0.12 0.13
Sones 6.6 5.2
595
CFM 3609 2938 2457
BHP 0.24 0.28 0.28
Sones 8.8 7.8 6.9
LB/LBP-21-3 1/3 651
CFM 3948 3371 2970 2354
BHP 0.32 0.36 0.36 0.34
Sones 10.1 8.8 8.2 6.9
LB/LBP-21-5 1/2
699
CFM 4239 3724 3362 2954 1964
BHP 0.39 0.44 0.45 0.45 0.38
Sones 11.6 9.9 9.3 8.6 7.1
747
CFM 4531 4056 3741 3390 2909
BHP 0.48 0.53 0.54 0.55 0.53
Sones 13.4 11.2 10.4 9.8 9.1
LB/LBP-21-7 3/4
801
CFM 4858 4424 4157 3833 3491 2937
BHP 0.59 0.65 0.66 0.67 0.68 0.64
Sones 15.5 12.9 11.8 11.3 10.8 10.1
855
CFM 5186 4790 4553 4261 3954 3608
BHP 0.72 0.79 0.8 0.81 0.82 0.82
Sones 16.7 14.4 13.3 12.8 12.1 11.5
LB/LBP-21-10 1 899
CFM 5452 5087 4858 4602 4313 4019 2894
BHP 0.83 0.91 0.93 0.94 0.95 0.96 0.86
Sones 17.1 15.4 14.5 13.9 13.4 12.7 11.7
LB/LBP-21-15 11⁄2
1010
CFM 6126 5826 5614 5415 5183 4926 4386 3369
BHP 1.18 1.26 1.3 1.32 1.34 1.35 1.36 1.24
Sones 20 18.9 18.1 17.3 16.6 16.2 15.0 14.0
1077
CFM 6532 6260 6068 5877 5691 5451 4965 4395
BHP 1.43 1.52 1.56 1.59 1.61 1.62 1.65 1.63
Sones 22 21 20 19.4 18.8 18.2 17.3 16.4
LB/LBP-21-20 2 1200
CFM 7278 7034 6890 6712 6542 6375 5954 5517 5013 4122
BHP 1.98 2.07 2.12 2.18 2.2 2.22 2.25 2.28 2.26 2.11
Sones 26 25 25 24 23 23 22 21 20 18.5
MAX. BHP AT A GIVEN RPM - (rpm/910)3
MAXIMUM FRPM = 1200
TIP SPEED = rpm x 5.596
MAX. MOTOR FRAME SIZE = 145T
30
(762)
51
(1295)
23
(584)
23
(584)
6
(152)
36
(914)
46
(1168)
241⁄2
(622)
19
(483)
43
(1092)
30
(762)
30
(762)
30
(762)
LB-21 LBP-21
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 18 (457) 18 (457)
Roof Opening Square 201⁄2(521) 201⁄2(521)
Weight* Galvanized,
145 (66)
Aluminum,
191 (86)
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.

17
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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
m3/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/ft3
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 11⁄2787
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
451⁄2
(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)
231⁄2
(597)
201⁄2
(521)
63⁄4
(171)
40
(1016)
491⁄2
(1257)
20
(508)
34
(864)
34
(864)
34
(864)
231⁄2
(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 261⁄2(673) 261⁄2(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.

18
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 30
Belt Drive
0 5 10 15 20 25
0
100
200
300
400
0 2 4 6 8 10 12 14 16
0.0
0.5
1.0
1.5
2.0
Static Pressure in. wg
cfm X 1000
m3/hr X 1000
Static Pressure Pa
1 1/2 hp
1/3 hp
1/2 hp
3/4 hp
1 hp
2 hp
3 hp
RPM
HP
Density 0.075 lb/ft3
5 hp
835
714
230
351
472
593
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
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.25 0.375 0.5 0.625 0.75 1 1.25 1.5 1.75
LB/LBP-30-3 1/3
230
CFM 3910
BHP 0.076
Sones 8.0
366
CFM 6221 4729
BHP 0.31 0.37
Sones 8.7 5.9
LB/LBP-30-5 1/2
394
CFM 6697 5354 4290
BHP 0.38 0.45 0.44
Sones 9.0 6.5 6.0
421
CFM 7156 5939 5076
BHP 0.47 0.54 0.55
Sones 9.7 7.4 6.7
LB/LBP-30-7 3/4 483
CFM 8210 7196 6567 5777
BHP 0.7 0.8 0.83 0.83
Sones 12.0 10.7 9.7 8.8
LB/LBP-30-10 1 529
CFM 8992 8079 7559 6946 6162
BHP 0.92 1.04 1.07 1.1 1.09
Sones 13.8 12.9 12.1 11.4 10.3
LB/LBP-30-15 11⁄2
567
CFM 9638 8797 8334 7786 7174 6410
BHP 1.14 1.27 1.31 1.34 1.36 1.33
Sones 15.3 14.2 13.6 13.0 12.3 11.2
605
CFM 10284 9507 9073 8605 8068 7434
BHP 1.38 1.53 1.57 1.61 1.64 1.64
Sones 16.8 15.7 15.2 14.6 14.1 13.3
LB/LBP-30-20 2 667
CFM 11338 10639 10257 9863 9419 8933 7737
BHP 1.85 2.02 2.07 2.12 2.16 2.19 2.17
Sones 19.8 18.6 17.9 17.5 17.1 16.6 14.9
LB/LBP-30-30 3 703
CFM 11950 11287 10935 10562 10184 9722 8701 7032
BHP 2.17 2.34 2.41 2.46 2.51 2.54 2.57 2.41
Sones 22 20 19.5 19.1 18.7 18.3 17.0 14.2
LB/LBP-30-50 5 835
CFM 14194 13635 13356 13062 12747 12432 11728 10951 9965 8478
BHP 3.63 3.84 3.95 4.03 4.09 4.14 4.24 4.33 4.29 4.06
Sones 27 26 25 25 24 24 23 22 21 18.2
MAX. BHP AT A GIVEN RPM - (rpm/512)3
MAXIMUM FRPM = 835
TIP SPEED = rpm x 7.985
MAX. MOTOR FRAME SIZE = 184T
50
(1270)
40
(1016)
63
(1600)
265⁄8
(676)
291⁄2
(749)
81⁄2
(216)
46
(1168)
58
(1473)
23
(584)
40
(1016)
40
(1016)
40
(1016)
261⁄2
(673)
LB-30 LBP-30
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 30 (762) 30 (762)
Roof Opening Square 321⁄2(826) 321⁄2(826)
Weight* Galvanized,
249 (113)
Aluminum,
318 (144)
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.

19
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 36
Belt Drive
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 1.5
LB/LBP-36-5 1/2
220
CFM 6204
BHP 0.16
Sones 4.9
315
CFM 8884 6937
BHP 0.47 0.55
Sones 8.2 6.3
LB/LBP-36-7 3/4 360
CFM 10153 8570 7487
BHP 0.7 0.81 0.83
Sones 10.6 8.9 7.9
LB/LBP-36-10 1 397
CFM 11196 9816 8911 7775
BHP 0.94 1.08 1.1 1.1
Sones 13.7 12.1 10.6 9.4
LB/LBP-36-15 11⁄2
426
CFM 12014 10765 9964 9056 7716
BHP 1.16 1.32 1.35 1.37 1.34
Sones 14.8 14.0 12.7 11.6 10.1
454
CFM 12804 11668 10949 10127 9209 7552
BHP 1.41 1.58 1.63 1.65 1.66 1.57
Sones 16.0 15.4 14.5 13.7 12.5 11.0
LB/LBP-36-20 2 499
CFM 14073 13064 12442 11760 11004 10173 8773
BHP 1.87 2.06 2.13 2.17 2.2 2.2 2.12
Sones 18.2 17.6 17.2 16.6 16.1 15.1 13.9
LB/LBP-36-30 3
536
CFM 15116 14196 13646 13037 12361 11652 10837 9559
BHP 2.31 2.52 2.61 2.67 2.7 2.73 2.72 2.65
Sones 20 19.7 19.3 18.7 18.4 17.8 16.7 15.8
572
CFM 16132 15287 14790 14229 13649 12989 12313 11534
BHP 2.81 3.04 3.14 3.21 3.26 3.29 3.32 3.31
Sones 22 22 21 21 20 19.9 19.0 18.1
LB/LBP-36-50 5
614
CFM 17316 16540 16087 15598 15066 14504 13890 13262 11584
BHP 3.48 3.72 3.84 3.93 3.99 4.05 4.08 4.1 4.04
Sones 25 24 24 24 23 23 22 21 19.2
678
CFM 19121 18419 18041 17621 17165 16683 16192 15636 14494 12970
BHP 4.69 4.95 5.08 5.21 5.3 5.37 5.44 5.47 5.52 5.45
Sones 30 29 29 29 28 27 27 26 24 22
MAX. BHP AT A GIVEN RPM - (rpm/384)3
MAXIMUM FRPM = 678
TIP SPEED = rpm x 9.425
MAX. MOTOR FRAME SIZE = 184T
60
(1524)
46
(1168)
63
(1600)
325⁄8
(829)
27
(686)
93⁄4
(248)
513⁄4
(1314)
63
(1600)
26
(660)
46
(1168)
46
(1168)
46
(1168)
343⁄8
(873)
LB-36 LBP-36
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 36 (914) 36 (914)
Roof Opening Square 381⁄2(978) 381⁄2(978)
Weight* Galvanized,
338 (153)
Aluminum,
444 (201)
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.
0 10 20 30
0
100
200
300
400
0 2 4 6 8 10 12 14 16 18 20
0.0
0.5
1.0
1.5
2.0
Static Pressure in. wg
cfm X 1000
m3/hr X 1000
Static Pressure Pa
RPM
HP
Density 0.075 lb/ft3
1 1/2 hp
3/4 hp
1 hp
1/2 hp
2 hp
3 hp
5 hp
678
586
494
403
311
220
D
O
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
O
F
T
H
IS
SY
S
T
E
M
C
U
R
V
E

20
LB Dimensions
LBP Dimensions
13⁄4
(44)
13⁄4
(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 42
Belt Drive
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 1 1.25
LB/LBP-42-5 1/2
190
CFM 8328 6455
BHP 0.21 0.25
Sones 5.2 4.3
247
CFM 10827 9583 7772
BHP 0.47 0.53 0.55
Sones 6.9 6.0 5.5
LB/LBP-42-7 3/4 283
CFM 12405 11362 9965 7932
BHP 0.71 0.78 0.83 0.81
Sones 8.3 7.6 7.1 6.5
LB/LBP-42-10 1 311
CFM 13632 12718 11521 10057
BHP 0.94 1.02 1.08 1.1
Sones 9.8 9.3 8.7 8.3
LB/LBP-42-15 11⁄2
334
CFM 14640 13812 12766 11480 9795
BHP 1.17 1.25 1.33 1.37 1.35
Sones 11.5 11.0 10.4 9.8 9.2
356
CFM 15605 14828 13887 12733 11417 9401
BHP 1.41 1.5 1.58 1.64 1.66 1.59
Sones 13.2 12.7 12.1 11.5 10.8 10.3
LB/LBP-42-20 2 392
CFM 17183 16477 15667 14715 13626 12382 10481
BHP 1.89 1.98 2.08 2.16 2.21 2.21 2.13
Sones 16.1 15.5 14.9 14.3 13.7 13.2 12.9
LB/LBP-42-30 3
420
CFM 18410 17751 17030 16205 15201 14135 12945 11013
BHP 2.32 2.42 2.52 2.62 2.68 2.72 2.72 2.61
Sones 18.6 18.0 17.3 16.6 16.1 15.4 15.3 15.2
448
CFM 19637 19020 18378 17605 16740 15786 14735 13494
BHP 2.82 2.93 3.04 3.14 3.22 3.28 3.3 3.28
Sones 22 21 20 19.4 18.8 18.1 17.5 17.6
LB/LBP-42-50 5
482
CFM 21128 20554 19980 19281 18562 17683 16796 15798 14692
BHP 3.51 3.63 3.74 3.86 3.97 4.04 4.1 4.11 4.09
Sones 23 23 22 22 21 20 19.3 18.7 18.5
515
CFM 22574 22037 21500 20887 20214 19480 18651 17822 16871 14331
BHP 4.28 4.41 4.53 4.65 4.77 4.87 4.94 5.01 5.01 4.88
Sones 25 24 24 24 23 22 21 21 20 19.3
0 10203040
0
100
200
300
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
YS
T
E
M
C
U
R
V
E
0 2 4 6 8 10 12 14 16 18 20 22 24
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Static Pressure in. wg
cfm X 1000
m3/hr X 1000
Static Pressure Pa
5 hp
3 hp
2 hp
1 1/2 hp
1 hp
3/4 hp
1/2 hp
515
450
385
320
255
190
RPM
HP
Density 0.075 lb/ft3
MAX. BHP AT A GIVEN RPM - (rpm/301)3
MAXIMUM FRPM = 515
TIP SPEED = rpm x 11.061
MAX. MOTOR FRAME SIZE = 184T
705⁄8
(1794)
52
(1321)
75
(1905)
373⁄8
(949)
331⁄2
(851)
111⁄2
(292)
58
(1473)
701⁄2
(1791)
29
(737)
52
(1321)
52
(1321)
52
(1321)
381⁄4
(972)
LB-42 LBP-42
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 42 (1067) 42 (1067)
Roof Opening Square 441⁄2(1130) 441⁄2(1130)
Weight* Galvanized,
396 (180)
Aluminum,
530 (240)
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.