Patent ID: 7575511

Claim:
A temperature door for an air-handling system of a heating, ventilating, and air conditioning system for a vehicle comprising: a first surface; a second surface spaced apart from the first surface; a pivoting structure disposed between and spaced from the first surface and the second surface, the pivoting structure defining an axis, wherein the temperature door is configured to pivot about the axis in a housing of the air-handling system; a third surface interposed between the first surface and the second surface, wherein the first surface, the second surface, and the third surface cooperate to cause air to selectively flow between hot and cold paths to control a temperature stratification of the air; and a substantially convex curved surface interposed between the first surface and the second surface and spaced from the third surface, wherein the convex curved surface is convex relative to the shaft, and a cross section taken through the third surface and the convex curved surface at any location along substantially the entire length of the temperature door, and at an angle normal to at least one of the third surface and the convex curved surface, is substantially ovoid-shaped, the convex curved surface adapted to minimize turbulence as air flows adjacent thereto.