The installation of conditioning systems requires a preliminary evaluation on which plant to use: often it is not necessary to connect external units to the internal ones through pipes in subsurface systems. The best solution in this case is to use an anti-shock PVC split duct connection system such as Profil Top Freddo or ProfilFREDDO. Both systems allow the installation with dedicated brackets and can be customized using the wide range of accessories available. The installation heating systems can be done in the same way by placing the hot water pipes inside the skirting equipped for Profil Top Caldo consisting of an aesthetic anti-shock box profile.