G – Ventrolla Perimeter Sealing Technique (VPSS). The Ventrolla Perimeter Sealing Program (VPSS) comprises many draught-proofing things that function alongside one another to seal the whole perimeter in the sash window. These include the sealing process installed higher than the very best sash, possibly inside the sash by itself or in certain parting https://tonyi556gwm5.wikifrontier.com/user