G – Ventrolla Perimeter Sealing Method (VPSS). The Ventrolla Perimeter Sealing Program (VPSS) comprises a variety of draught-proofing features that function jointly to seal your complete perimeter of the sash window. These consist of the sealing procedure installed over the best sash, either in the sash itself or in a few parting bead https://fredw443bys5.wikimidpoint.com/user