To make a radiating false ceiling two kinds of GKC plasterboard panels are available: active and inactive. The active panels have a radiating capacity whereas inactive ones have just an aesthetic function. In the first case inside the panels heat diffusers in passivated aluminium are embedded and glued on the panel in the factory; inside a passage of 21 mm of diameter allows water circulation. Head diffusers are connected one to the other through PE-RT 16x1,5 mm polyethylene pipes and are completed with the necessary connections for the connection to adjacent panels. Inactive panels do not have heat diffusers.