G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing Procedure (VPSS) comprises several draught-proofing aspects that perform with each other to seal the entire perimeter on the sash window. These contain the sealing procedure installed above the top sash, either in the sash by itself or in some parting bead facing https://theodoree712eek8.techionblog.com/profile