Patent ID: 8758101

Claim:
An exhaust fan housing comprising a first cylindrical or conical element, a second cylindrical element interior of said first cylindrical or conical element, and an annular chamber having an outer wall formed by the first cylindrical or conical element and an inner wall formed by the second cylindrical element, a plurality of hollow vanes extending radially across the annular chamber and operatively uniting said first cylindrical or conical element and said second cylindrical element, an interior space delimited by said second cylindrical element in fluid communication with ambient air exterior of said first cylindrical or conical element via said hollow vanes, each hollow vane characterized by spaced apart wall segments which unitingly terminate so as to extend radially from the outer wall to the inner wall of the annular fluid passage chamber delimiting an airfoil-shaped leading edge for each hollow vane, each of said spaced apart wall segments having an open end extending radially across the annular chamber delimiting first and second trailing edges for each hollow vane, one trailing edge of said spaced apart wall segments include a tab extending radially outward beyond an exterior of the first cylindrical or conical element for mated union with a portion of a windband assembly to operatively link the windband assembly to said exhaust fan housing.