Abstract: A set of cooling air blowers for machines which require cooling air during operation. The blowers each include an outlet having an anti-reverse flow feature for preventing the flow of air into the blower from externally of the machine should the blower fail, thereby ensuring that the remaining operating blowers are able to maintain a normal and adequate flow of cooling air through the air inlet of the machine and outwardly through the outlets of the remaining operating blowers. Each blower generally includes a blower housing having an inlet, an outlet, and an internal cavity in which an impeller is rotatably disposed, the impeller driven by an electrical motor mounted within the blower housing.

Abstract: A furnace blower assembly having a single piece impeller formed from a stamped metal material. The impeller of the blower assembly is formed from a single piece of metal material and includes a plurality of individual impeller blades each having a blade portion bent at a 90° angle relative to the back wall of the impeller. Each of the impeller blades is backward inclined and forward curved to increase the efficiency of the impeller.