(57) A heat exchanger is provided comprising a stack of a plurality of pairs of heat exchanger
plates (1,a, 1b, 1c) formed of sheet metal having a three-dimensional structured pattern,
a first flow path being defined within the plurality of pairs and a second flow path
being defined between said pairs, each plate having at least one through-opening. It is intended to have a solid connection between adjacent heat exchanger plates. To this end at least one auxiliary opening is provided in said plate (1a, 1b, 1c),
said auxiliary opening having a raised edge forming a flange (11, 13, 14), said flange
(11, 13, 14) being inserted into a corresponding auxiliary opening of a neighbouring
plate.
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