Greenheck Fan SQ - Manual (Page 5)

5
Standard Construction Features
CABINET CONSTRUCTION
The fan housing is constructed of rigid structural
members and formed galvanized steel panels.
(Aluminum construction is optional in all SQ sizes
60-160 and in BSQ sizes 70-300.)
WHEEL
An aluminum, backward inclined, non-overloading
centrifugal wheel is utilized to deliver maximum
efficiency. Each wheel is statically and
dynamically balanced.
DUCT COLLARS
Inlet and discharge duct collars are provided
for easy duct connection. The square design
provides a larger discharge area than tubular,
centrifugal, and vane axial fans; outlet velocities
are reduced for quieter operation.
ACCESS PANELS
The cabinet construction features two side
access panels. Access panels permit easy access
to all internal components. The access panels
have been removed on the drawing.
DRIVE FRAME
Constructed from heavy gauge steel. Belt
adjustment is accomplished by loosening
fasteners, sliding the motor plate, and retightening
fasteners.
MOTOR
Permanently lubricated, sealed ball bearing
motors are selected to provide years of trouble-
free operation with minimal maintenance.
BEARINGS
100 percent factory tested and designed
specifically for air handling applications with a
minimum L
10
life in excess of 100,000 hours (L
50
average life of 500,000 hours).
DRIVE ASSEMBLY
Drives are sized for a minimum of 150 percent
of driven horsepower. Machined cast iron
pulleys are factory set to the required RPM and
adjustable for final system balancing. Belts are
static free and oil resistant.
FAN SHAFT
Precisely sized, ground, and polished so the
first critical speed is at least 25 percent over the
maximum opportunity speed. Close tolerances
where the shaft makes contact with bearings
result in longer bearing life.
DISCONNECT SWITCH
NEMA-1 disconnect switch is factory mounted
and wiring is provided from the motor as
standard. All wiring and electrical components
comply with the National Electric Codes and
materials are UL Listed. Other NEMA enclosure
disconnect switches are optional.