<p>The distribution panel has a bottom plate which is connected with lower horizontal transverse struts (1), a peripheral seal which is provided at the lower side of the bottom plate, and a snap tab which is provided at the outer edge of the bottom plate and is received in detent receptacle. The lower transverse strut has a sealing edge (7) at an end of distribution panel support (6). The snap tab on the transverse strut exerts the force, so that the sealing edge against the peripheral seal of the bottom plate is pressed.</p>
