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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