Mixed flow centrifugal type exhaust fan for moderate sized ventilation applications specifically designed to bridge the transition from centrifugal to axial.  FKD series fans offer substantially quieter performance and are easier to install than axial arrangements.  Fans can be mounted at any angle at any point along the duct work.  Straight-through air flow design allows for easy installation.  Fans can easily be removed from duct work for service.  Fan motors are capable of operating in air stream temperatures of 140 degrees F.  Motor bearings are permanently sealed, self lubricating ball type.  All fans are 100% speed controllable through a decrease in the voltage by using a solid state or transformer type control.  Fan housings are constructed of formed galvanized steel casings and pressed inlet and outlet cones.  Internal structural members and motor mounting bracket combine to form a rigid framework supporting the motor and impeller.  Integral turning vanes for maximized air flow and pressure are included.  Fan impellers are non-overloading mixed flow axial / centrifugal type.  The FKD 14XL through FKD 18 impeller is a high density polyamide resin.  The impellers of the FKD 8XL through FKD14, FKD 18XL, and FKD 20 are made of aluminum.