Patent ID: 8313299

Claim:
A centrifugal wheel comprising a planar back plate lying in a single plane and including a hub portion, and an outer edge, the back plate including a depending central hub extending downwardly from the plane in which the black plate lies; a front plate spaced from the back plate, the front plate includes a central aperture defining an inner edge of the front plate and an outer edge radially spaced from the inner edge, the front plate also includes a frustoconical central body extending between the inner edge and the outer edge, the central body extending downwardly at a constant angular orientation as it extends radially outwardly from the inner edge to the outer edge; a longitudinal axis extending through the front and back plates and through the depending central hub; a plurality of blades extending between the front and back plates and attached to the hub portion, each blade having an outer edge, the blade outer edge inclined relative to the longitudinal axis, wherein a diameter of the front plate along the outer edge of the front plate is greater than a diameter of the back plate along the outer edge of the back plate allowing air moved by the plurality of blades to extend away from the front plate in the longitudinal direction extending from the front plate to the back plate.