The present invention involves a flat finheat exchanger configuration with a plurality oflouvers and a rib raised above the plane of thefin connecting adjacent tube collars. The raisedrib configuration enhances the heat transfercharacteristics of the fin, and allows for the useof thinner materials to lower cost withoutdiminishing performance. The exterior fin surface"scoops" and redirects air flow from the leadingedge to the trailing edge of the fin. This"scooping" effect directs the air flow over and inbetween the interrupted surfaces, thus breaking upair boundary layer around the fin. The louvers ofthe fin are oriented relative to the air flow insuch a manner that each louver in effect createsanother leading edge contributing to a higher heattransfer coefficient. Also, the location of theraised rib also enhances the heat transfer betweenthe fin and the circulated air. The fin collarsare also surrounded by a raised portion so thatone raised rib and its two adjacent raisedportions bordering the collar form a "dog bone"type shape. The leading and trailing edges areserrated to improve the structural rigidity andcreate turbulence in the air flow. Also, theleading and trailing edges are oriented at aslight angle, e.g., 12°, relative to the plane ofthe fin. The louvers are oriented at a slightlygreater angle than the leading and trailing edges,e.g., 20°-35°.
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