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The louvered fin geometry is widely used for heat transfer to air in automotive heat exchangers. The only published correlation for heat transfer and friction in the corrugated louver fin geometry is that of Davenport. However, this correlation is strictly empirical, since it is based on a multiple regression correlation using dimensional parameters assumed to be important. Further, the correlation does not include the dimensions of the inlet/exit and the internal flow redirection louvers. The objective of the present work is the development of an improved, rationally based correlation. The correlation is based on dividing the total fin surface into four different regions, and applying rationally based heat transfer and friction equations to each of these regions. The resulting correlation is semi-analytical, since it is based on heat transfer mechanisms and theoretical relationships expected to apply the various regions of the fin.