Patent ID: 6435964
Filing Date: 2002-08-20
Classification: F24F

Abstract:
A ventilation fan comprising a housing, a motor, a centrifugal fan, and a face cover, whereinsaid housing is comprised of a rectangular case-like frame and a wind box, said case-like frame comprising an opening through top and bottom sides thereof, a rib extended across the center of said opening and adapted to hold said motor inside said case-like frame in such a position that the motor shaft of the motor extends over the top side of said case-like frame for the mounting of said centrifugal fan; two elongated slots disposed on the top side of said case-like frame, and a plurality of retaining holes, said wind box being a whirl pool chamber covered on the top side of said case-like frame over said centrifugal fan, said wind box comprising a plurality of border hooks respectively fastened to the retaining holes of said case-like frame, an air output port for output of air, and a valve flap hinged to said air output port to let air pass through said air output port to the outside of said wind box and to prohibit outside air from passing through said air output port to the inside of said wind box; said face cover is covered on said the bottom side of case-like frame over said motor, comprising two coupling flanges respectively fastened to the elongated slots of said case-like frame, and a plurality of air inlets in air communication with said opening of said case-like frame.