Standard Construction Features
1Cabinet 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).
2Drive Frame
Constructed from
7Drive 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.
3Wheel
An aluminum, backward inclined, non- overloading centrifugal wheel is utilized to deliver maximum efficiency. Each wheel is statically and dynamically balanced.
4Duct 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.
5Motor
Permanently lubricated, sealed ball bearing motors are selected to provide years of
6Bearings
100 percent factory tested bearings are designed specifically for air handling applications with a minimum L10 life in excess of 100,000 hours (L50 average life in excess of 500,000 hours).
8Fan Shaft
Fan shafts are precisely sized, ground and polished so the first critical speed is at least
25 percent over the maximum operating speed. Close tolerances where the shaft makes contact with bearings result in longer bearing life.
9Disconnect Switch
Access Panels (not shown on images) The cabinet construction features two removable access panels permitting easy access to all interior components.
5
