G – Ventrolla Perimeter Sealing Program (VPSS). The Ventrolla Perimeter Sealing Method (VPSS) comprises a variety of draught-proofing features that perform collectively to seal the complete perimeter in the sash window. These consist of the sealing process installed higher than the very best sash, both within the sash by itself or in some https://lisay528hcs4.blogsvirals.com/profile