Patent ID: 8267161

Claim:
A fin for a heat exchanger, comprising: a fin element extending in a fluid flow direction, the fin element comprising a plurality of wall faces, at least one of which is connected to at least one flap, wherein the at least one flap comprises a flat tab face, and a curved side wall connecting the tab face to the at least one of the wall faces, wherein the tab face is bordered by a first straight tab edge, a curved tab edge, and a second straight tab edge, the first straight tab edge running parallel to the fluid flow direction and being an edge along which the tab face is attached directly to the at least one of the wall faces, wherein the curved side wall is bordered by a first curved side wall edge, a straight side wall edge, and the curved tab edge, the first curved side wall edge being an edge along which the side wall is attached directly to the at least one of the wall faces, wherein the curved tab edge has a first end that is separated from the at least one of the wall faces by the straight side wall edge, and a second end that meets a corresponding second end of the first straight tab edge at a point on the at least one of the wall faces, wherein the second straight tab edge connects the first end of the curved tab edge to a corresponding first end of the first straight tab edge, and wherein an opening is formed by the at least one of the wall faces, the second straight tab edge, and the straight side wall edge.