G – Ventrolla Perimeter Sealing Program (VPSS). The Ventrolla Perimeter Sealing System (VPSS) comprises various draught-proofing elements that get the job done with each other to seal the complete perimeter of your sash window. These contain the sealing technique mounted over the top sash, either inside the sash itself or in certain parting https://harrym115uvy9.wikicorrespondence.com/user