Patent ID: 7021370

Claim:
A fin-and-tube type heat exchanger comprising: a plurality of fins disposed adjacent to each other with each of said fins defining a plane and having an upstream portion and a downstream portion; a plurality of louvers formed in each of said fins with each louver extending at an angle with respect to said planes of said fins; a plurality of tubes passing through said plurality of fins interconnecting said fins wherein said upstream portions of said plurality of interconnected fins define an incoming airflow side of said heat exchanger and said downstream portions of said plurality of interconnected fins define an outgoing airflow side of said heat exchanger; and said plurality of louvers defining a first bank of louvers formed in each of said upstream portions of said fins facing said incoming airflow side of said heat exchanger and a second bank of louvers formed in each of said downstream portions of said fins facing said incoming airflow side of said heat exchanger such that all of said louvers are facing the same direction toward said incoming airflow side whereby said louvers effectively redirect and mix an incoming flow of air and minimize an air pressure drop across said fins for increasing a heat transfer between said tubes, said fins, and the flow of air; wherein each of said fins includes a first outer surface and a second outer surface with each of said louvers extending outwardly from only said first outer surface such that said louvers all extend in a common direction.