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5
Standard Construction Features
1 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).
2 Drive Frame
Constructed from heavy-gauge steel.
3 Wheel
An aluminum, backward inclined, non-
overloading centrifugal wheel is utilized to
deliver maximum efficiency. Each wheel is
statically and dynamically balanced.
4 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.
5 Motor
Permanently lubricated, sealed ball
bearing motors are selected to provide
years of trouble-free operation with
minimal maintenance.
6 Bearings
100 percent factory tested bearings are
designed specifically for air handling
applications with a minimum L
10
life in excess
of 100,000 hours (L
50
average life in excess
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. Belt adjustment is
accomplished by loosening fasteners, sliding
the motor plate and retightening fasteners.
Fan Shaft
Fan shafts are precisely sized, ground and
polished so the first critical speed is at least
25percent over the maximum operating 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.
Access Panels (not shown on images)
The cabinet construction features two
removable access panels permitting easy
access to all interior components.
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