G – Ventrolla Perimeter Sealing System (VPSS). The Ventrolla Perimeter Sealing Process (VPSS) comprises a variety of draught-proofing elements that get the job done jointly to seal the complete perimeter from the sash window. These incorporate the sealing method put in earlier mentioned the top sash, both throughout the sash alone or in https://jimx207iwl0.wikitron.com/user