The cladding plate has angled edges (12) connected together in one piece and containing in these edges ventilation slits (11). The edges are offset backwards in saw tooth fashion. The angled edges have different edge angles (27-29). The ventilation slits can be punched through in the recessed angled walls. The angled edges can be connected together through front connecting webs (24) forming the front side (13) and inner connecting webs forming the inside (14).
