Severe Duty Curb Installation Options
1.75 INCH (44 MM)
Concrete
CURB HEIGHT
12, 18, OR 24 INCHES (305, 457, or 610 MM)
MINIMUM CONCRETE 
STRENGTH OF 3000 PSI
4 INCH (102 MM)
MOUNTING FLANGE
TYPICAL
OUTSIDE CURB DIMENSION |
|
THROAT DIMENSION | 1.75 INCH (44 MM) |
(ROOF OPENING) |
|
1 INCH (25 MM) INSULATION
HILTI KB11,
12 INCH (305 MM) MAXIMUM CENTERS. MINIMUM TWO PER SIDE.
ROOF OPENING
|
| 2.5 INCH (57 MM) |
|
| EMBEDMENT |
|
|
|
1.75 INCH (44 MM) | 2.25 INCH (57 MM) TYPICAL | |
| 4 INCH (102 MM) TYPICAL | |
OUTSIDE FLANGE DIMENSION
THROAT DIMENSION AND ROOF OPENING EQUAL OUTSIDE CURB DIMENSION MINUS 3.5 INCHES (89 MM)
Steel
| OUTSIDE CURB DIMENSION | |
1.75 INCH (44 MM) | THROAT DIMENSION | |
(ROOF OPENING) | ||
|
CURB HEIGHT |
| |
12, 18, OR 24 INCHES | 1 INCH (25 MM) INSULATION | |
(305, 457, 610 MM) | ||
|
4 INCH (102 MM) 
MOUNTING FLANGE
TYPICAL
ROOF OPENING
6 X 3 INCH (152 x 76 mm)
STEEL MOUNTING ANGLE (12 GAUGE MINIMUM)
1.75 INCH (44 MM)
CORNER TOP VIEW
HILTI
THREE (3) FASTENERS EACH CORNER AND
MAXIMUM OF 4.5 INCHES (114 mm) SPACING;
ADD ADDITIONAL FASTENERS TO SATISFY.
CORRUGATED
ROOF DECK
ROOF TRUSS |
|
1.75 INCH (44 MM) | 2.25 INCH (57 MM) TYPICAL |
| 4 INCH (102 MM) TYPICAL |
OUTSIDE FLANGE DIMENSION |
|
THROAT DIMENSION AND ROOF OPENING EQUAL OUTSIDE CURB DIMENSION MINUS 3.5 INCHES (89 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.
LB - 30 - 7
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
Motor hp (Belt Drive only) |
| |||
6 = 1/6 | 10 | = 1 | 50 | = 5 |
4 = 1/4 | 15 | = 11⁄2 | 75 | = 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
9
