Patent ID: 6386828
Filing Date: 2002-05-14
Classification: A01K,F04D,F24F,Y10T

Abstract:
A fan assembly for use in ventilation of a building, which comprises:(a) a housing having an outlet with a conical shape and an inlet with an inner cavity extending between the inlet and the outlet, the inner cavity having a center portion with a circular cross-section; (b) a bracket mounted in the inner cavity of the housing spaced between the inlet and the center portion; and (c) a fan mounted on the bracket and having a motor connected to a shaft with a propeller mounted on one end of the shaft, the fan being mounted on the bracket such that the propeller is spaced apart from the inlet and the outlet of the housing, the propeller having blades, each blade having a shape such that when the propeller is rotating, an axial velocity of air coming off the propeller is essentially constant along most of a length of the blades from a tip of the blades toward the shaft wherein the blades of the propeller are located in the center portion of the inner cavity spaced apart from the inlet of the housing.