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,
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 L10 life in excess of 100,000 hours (L50 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
5
