Patent ID: 8057185

Claim:
A forward swept centrifugal fan wheel comprising: a first endring ( 10 ); a second endring ( 11 ); a plurality of blades ( 12 ) connected between the first endring and the second endring, each blade having a substantially continuous arcuate form that extends from the first endring to the second endring along an axis parallel to an axis of rotation (A-A); and each blade having a substantially continuous arcuate cross-section taken with respect to a plane which extends normally from the axis of rotation (A-A); and each blade when viewed in plan with a tangent line (T) is disposed in the plan, having a point (P) midway between the first endring and the second endring such that the point (P) leads each blade in the direction of rotation (D) of the wheel in a convex blade orientation.