Abstract: The Invention relates to an exchanger comprising a network of channels extending between two parallel faces, in order to allow the circulation of a heat transfer fluid in the channels and the heat exchange between this heat transfer fluid and the outside through at least one of the faces. The network of channels is formed by a three-dimensional hollow laminated panel based on fibres hardened by the impregnation of a resin, comprising two two-dimensional woven layers which are impervious and stiff forming the parallel faces, and a stiff weaving of orthogonal fibres, connecting the two layers together by providing a hollow intercalated space by forming rows of parallel walls between them defining the channels.