A fan (10) adapted to be driven by an electrical motor (12), the motor of the type having openings (14) to permit the flow of air therethrough to cool internal components of the motor. The fan comprising a cup-shaped hub (20) adapted to be driven by the motor and including a plurality of arcuately shaped...http://www.google.com/patents/US4838760?utm_source=gb-gplus-sharePatent US4838760 - Fan with motor cooling enhancement
