Patent ID: 7785069
Filing Date: 2010-08-31
Classification: F04D

Abstract:
1. A ventilation unit comprising: an electric motor having a solid walled casing and an output shaft fitted with a fan having a cup-shad central body and a number of blades; said central body being defined by a base wall and by an annular wall extending from and connecting with the base wall; said base wall being substantially continuously solid and having a central portion which is thicker than the rest of the base wall; said annular wall having an inner face and an outer face, the number of blades extending from the outer face; and a number of reinforcing ribs having opposing ends formed to connect at one end to the central portion of the base wall and to connect at another end to the inner face of the annular wall; wherein a number of through windows are formed in the annular wall portion of said central body, and at peripheral edges where the base wall and the annular wall connect, each placed in the gap between two adjacent blades and between two adjacent reinforcing ribs to channel out any condensate formed inside said central body.