A heat exchanger for the heat exchange between a first fluid and a second fluid, which achieves an unusual strength comprises a plurality of casings (2), of substantially flattened shape and of predetermined width (L), arranged in a pile (2a), with an air space (3) defined between adjacent casings in the pile, and each formed from two half-shells (6) welded along a peripheral strip (6a), said casings (2) being in fluid communication with each other through respective holes (7) opening into said air space (3), and at least one spacer (8), substantially of the sleeve type, in said air space (3), made integral at the top end with said adjacent casings around the respective holes (7) opening into said air space (3).
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