(57) It comprises at least two profiles (1, 1'), preferably of aluminium, provided with
parallel heat dissipating fins (2, 2', 2"), which are assembled to each other by means
of engagement (3). The profiles (1, 1') have at least one housing (5) defined between
the heat dissipating fins (2, 2', 2") for insertion of at least one electric heating
plate (4, 4'). The heating plates (4, 4') comprise means of heating mounted inside
an external enclosure (11, 11') which consists of an elastically compressible closed
symmetrical profile of slightly greater width than the width of the housing (5) for
the press-fitting thereof in said housing (5).
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