Patent ID: 7413002

Claim:
A corrugated fin bent and formed into a wave-shape, comprising a plurality of both-side-cut-louvers, which are laminated on each other and formed into a group, and one-side-cut-louvers, which are arranged at end portions of the group of both-side-cut-louvers, being raised from the corrugated fin; wherein a cross section in the louver laminating direction of at least one of the one-side-cut-louvers is formed into a substantial V-shape, an inclined face of the one-side-cut-louver adjacent to the both-side-cut-louver crosses a centerline of the fin in the wall thickness direction and a length of the adjoining inclined face of the one-side-cut-louver is the same as that of the inclined face of the both-side-cut-louver; the plurality of both-side-cut-louvers includes two groups of both-side-cut louvers, the inclination directions of which are opposite to each other, and a respective one-side-cut-louver, the shape of which is formed into a V-shape, is arranged at both end portions of the two groups of both-side-cut-louvers.