Patent ID: 6769876
Filing Date: 2004-08-03
Classification: F01D,F04D,F05D,Y10S

Abstract:
A centrifugal ventilator fan, having multiple blades spaced about an axis of rotation, wherein air enters axially through an upstream end of the fan and is discharged radially from the fan, wherein an outlet angle of each blade is generally defined by a line extending outward from the outer end of a leading surface of each blade and a circle defined by the outer edges of the blades, and wherein a first fan outlet angle of each blade, which is measured at an upstream end of the fan, is less than a second fan outlet angle of the blades, which is measured at a downstream end of the fan, and wherein the first outlet angle of each blade is equal to zero degrees or greater and five degrees or less, and the second outlet angle is equal to thirty degrees or greater and forty-five degrees or less.