Patent ID: 6971444

Claim:
A heat exchanger construction comprising: a header plate including an interior side, an exterior side, and a plurality of tube openings spaced along a first axis and extending between the interior and exterior sides; a plurality of elongated flat tubes, each tube having a pair of opposed long sides and a pair of opposed short sides, each of the tubes having an end received in one of the tube openings extending past the interior side, each end including a pair of long edges defined by the long sides, each tube having a cut in each of its short sides extending from the end to adjacent the interior side of the header plate, each tube having a bend formed in each of the long sides of the tube adjacent the cut so that the long edges of the tube are adjacent the long edges of the tubes on either side of the tube wherein the long edges of each tube are overlapped with the long edges of the tubes on either side of the tube.