Heat exchanger fin with corrugated portion and louvers

A fin for a heat exchanger, comprising:

• a planar fin body having a first heat exchange area defining a leading portion, wherein air introduced from outside the fin body first contacts said leading portion of the fin body, and a second heat exchange area disposed directly adjacent to the first heat exchange area, said second heat exchange area defining a trailing portion, wherein the air introduced from the outside of the fin subsequently contacts the trailing portion of the fin body immediately after flowing through the leading portion of the first heat exchange area;
• a plurality of fin collars that pass through and protrude from said fin body, the plurality of fin collars being spaced apart from each other;
• a first fin portion disposed at or on the first heat exchange area;
• and
• a second fin portion disposed at or on the second heat exchange area,
• wherein the first fin portion is a corrugated fin portion including a leading corrugated fin portion bent in a counter-clockwise direction from the fin body to extend at an inclined angle from a flat surface of the fin body, and a trailing corrugated fin portion bent in a clockwise direction to extend at an inclined angle from a flat surface of the fin body, and the trailing corrugated fin portion joins the leading corrugated fin portion at an apex, thereby forming a bent portion, wherein the second fin portion comprises at least one louver type fin portion that extends at an inclined angle from a flat surface of the fin body, wherein each of the at least one louver type fin portion comprises a trailing side that extends above the planar fin body, and wherein at least one of said at least one louver type fin portion comprises a leading side that extends below the planar fin body,
• wherein the apex of the first fin portion is higher than an end tip of the trailing side of said at least one louver type fin portion,
• wherein a plane divides the planar fin body into the first heat exchanger area and the second heat exchange area, and the plane passes through a center of each of the plurality of fin collars in a direction that is perpendicular to a width direction of the fin body, thereby dividing each of the fin collars in a first half and a second half,
• wherein the first and second heat exchange areas equally divide the fin body in the width direction of the fin body, and
• wherein only the first fin portion and the first half of each of the fin collars of the plurality of fin collars are disposed within the first heat exchange area, and only the second fin portion and a second half of each of the fin collars of the plurality of fin collars are disposed within the second heat exchange area.