In the heat exchanger module, which is produced by stacking foil cards, provided with cutouts, and subsequently joining the individual cards of the card stack, each foil card (2) or group of foil cards of the stack is turned about a common axis by an angle alpha of between 0 and 30 DEG with respect to the preceding foil card (2) or group of foil cards. The cutouts (3) form spiral channels (4). <IMAGE>
