Patent ID: 9513029
Filing Date: 2016-12-06
CPC Classification: F04D,F24H

Claim Text:
1. An air handler comprising: an enclosure having an interior volume and a distribution air outlet opening on the enclosure that is adapted for communication with an air distribution system; a fan wheel in the enclosure interior volume, the fan wheel having an outer diameter dimension and a circumference dimension, the fan wheel having a center axis of rotation that defines mutually perpendicular axial and radial directions and the fan wheel being rotatable about the center axis of rotation in a rotation direction; a blower housing in the enclosure interior volume, the blower housing containing the fan wheel and having an air outlet opening, the blower housing having an outer wall with a volute-shaped portion that extends from a first end of the volute-shaped portion around the fan wheel in the rotation direction to a second end of the volute-shaped portion, and the volute-shaped portion of the blower housing outer wall having first and second sections as the volute-shaped portion extends in the rotation direction around the fan wheel, the first section of the volute-shaped portion subtending an angle of 270° at the fan wheel center axis and the second section of the volute-shaped portion subtending an angle of 90°, the first section of the volute-shaped portion having a positive expansion angle which increases at an exponential rate of 1.2 to 1.4, the second section of the volute-shaped portion having an expansion angle which increases at an exponential rate of 1.5 to 2.1.