G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing Process (VPSS) comprises a variety of draught-proofing aspects that function collectively to seal the complete perimeter from the sash window. These contain the sealing process set up over the top sash, both throughout the sash by itself or in a few parting https://marlonr393lor0.wikihearsay.com/user