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Severe Duty Curb
Installation Options
Concrete
MINIMUM CONCRETE
STRENGTH OF 3000 PSI
Steel
CURB HEIGHT
12, 18, OR 24 INCHES
(305, 457, 610 MM)
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.
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
OUTSIDE CURB DIMENSION
THROAT DIMENSION
1.75 INCH (44 MM)
CURB HEIGHT
1 INCH (25 MM) INSULATION
12, 18, OR 24 INCHES
(305, 457, or 610 MM)
4 INCH (102 MM)
MOUNTING FLANGE
TYPICAL
OUTSIDE FLANGE DIMENSION
THROAT DIMENSION AND ROOF OPENING EQUAL OUTSIDE CURB DIMENSION MINUS 3.5 INCHES (89 MM)
OUTSIDE CURB DIMENSION
1.75 INCH (44 MM)
1 INCH (25 MM) INSULATION
4 INCH (102 MM)
MOUNTING FLANGE
TYPICAL
6 X 3 INCH (152 x 76 mm)
STEEL MOUNTING ANGLE
(12 GAUGE MINIMUM)
ROOF TRUSS
OUTSIDE FLANGE DIMENSION
THROAT DIMENSION AND ROOF OPENING EQUAL OUTSIDE CURB DIMENSION MINUS 3.5 INCHES (89 MM)
LB - 30 - 7
1.75 INCH (44 MM)
(ROOF OPENING)
HILTI KB11, 3/8-16 X 3 ON
12 INCH (305 MM) MAXIMUM CENTERS.
MINIMUM TWO PER SIDE.
ROOF OPENING
1.75 INCH (44 MM)
2.25 INCH (57 MM) TYPICAL
4 INCH (102 MM) TYPICAL
THROAT DIMENSION
1.75 INCH (44 MM)
(ROOF OPENING)
ROOF OPENING
2.25 INCH (57 MM) TYPICAL
1.75 INCH (44 MM)
4 INCH (102 MM) TYPICAL
2.5 INCH (57 MM)
EMBEDMENT
CORNER TOP VIEW
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.
CORRUGATED
ROOF DECK
Motor hp
(Belt Drive only)
6
= 1/6
10
= 1
50
= 5
4
= 1/4
15
= 1
1
⁄
75
= 7
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
1
⁄
2
9
9
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