Patent ID: 8678131

Claim:
An acoustic baffle for reducing noise of a centrifugal fan, comprising: a base for mounting with a fan outlet; a projection extending from the length of the base at a back side of the base and curving away from a top surface of the base, the projection comprising: opposing left and right sides that are parallel to or aligned with left and right sides of the base; and an internal cutout forming a trough, a center point of the trough aligned with a center line of the base, ends of the left and right sides opposite the base forming left and right apices of the internal cutout; opposing inner sides of the projection defining the cutout continually tapering from the trough to the apices; wherein the projection extends over the fan wheel and the left and right sides of the projection continually widen from left and right fan tangency points to the trough, when the acoustic baffle is installed in the outlet.