G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing System (VPSS) comprises many draught-proofing components that function together to seal all the perimeter from the sash window. These consist of the sealing process set up previously mentioned the top sash, both within the sash by itself or in some parting bead https://bertiea948bhp1.vblogetin.com/profile