Greenheck Fan Series L - Manual (Page 5)

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 1
1 ⁄
2
in. (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)
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