Heat exchanger element and method for manufacturing such a heat exchanger element

Method for manufacturing a heat exchanger comprising a lamellar structure of a plurality of parallel heat exchange elements with an intermediate air gap between each pair of adjacent heat exchange elements;

• the method comprising:
• —interconnecting along a longitudinal direction of the lamellar structure the heat exchange elements in a top portion of the lamellar structure thus forming an inlet channel through the heat exchange elements, and—interconnecting in a bottom portion of the lamellar structure thus forming an outlet channel through the heat exchange elements, with the heat exchange elements forming parallel channels between the inlet channel and the outlet channel;
• —forming in the outlet channel of the heat exchanger a filler body, the filler body filling up cavities of the heat exchange elements below an opening of the outlet channel and forming a floor in the outlet channel along the longitudinal direction of the lamellar structure, wherein the filler body material is a thermoplastic or thermosetting synthetic material, and wherein the floor in the outlet channel is sloped downwards in the longitudinal direction of the lamellar structure towards an exhaust.