Patent ID: 6945322

Claim:
A heat exchanger comprising a plurality of heat exchanger units ( 4 ) which comprises a plurality of metal tubes ( 1 ) in which a fluid passes, metal fins ( 2 ) in contact with outer surfaces of said tubes ( 1 ) to promote heat exchange between said fluid and air, and header tanks ( 3 ) provided at opposite ends of said tubes ( 1 ) in the longitudinal direction and connecting to the plural tubes ( 1 ), and base header tanks ( 6 ) connecting to the respective header tanks ( 3 ) of the plural heat exchanger units ( 4 ), wherein the heat exchange units ( 4 ) are provided, on their ends in a direction orthogonal to the longitudinal direction of said tubes ( 1 ), with metal side plates ( 5 ) which are elongated in a direction parallel to the longitudinal direction of said tubes ( 1 ) which are connected to said fins ( 2 ) and the side plates ( 5 ) are provided, on the outer surfaces thereof, with projections ( 5 a ) projecting toward adjacent side plates ( 5 ).