Patent ID: 6254476
Filing Date: 2001-07-03
Classification: F04D,F24F

Abstract:
In a fan for circulating an air stream in an air treating environment, a substantially circular hub having a plurality of preselected contoured fan blades extending therefrom, each blade having an air stream leading and trailing edge and including a root portion adjacent the outer peripheral wall of said hub and a spaced distal tip portion, each blade including preselectively contoured air stream inlet and air stream outlet faces with selected portions of each blade disposed at preselected angles to an imaginary plane passing normally through the rotational axis of said hub, each root portion of each blade being at a preselectively substantially greater angle to said imaginary plane adjacent said root portion thereof than at said tip portion with said air stream outlet face of each blade being so contoured that imaginary curvature arcs taken substantially parallel to said outer peripheral wall of said hub on said air stream outlet face of said blade between said leading and trailing blade edges varying in length from blade root portion to blade tip portion with an imaginary arc taken substantially adjacent said tip portion being of the greatest length whereby the major portion of said air stream emanating from said air stream outlet face of each blade flows substantially parallel said rotational axis of said hub.