Method for increasing the heat exchange area in a heat exchanger, consisting in connecting fins, made of metal strip with any surface profile, to the surface of the exchanger members, between which, a space is formed for the flow of the heat exchange medium. The fins are joined to the surface of the exchanger member at an angle, preferably 90°, to that surface, along the fin side, forming open passages between the fins for the flow of the medium. In the heat exchanger pack with an increased heat exchange area, the fins (1) are conveniently joined between flat tubes (4) or plates (8), in the medium flow space, forming open passages (5) for the flow of that medium.
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