G – Ventrolla Perimeter Sealing Technique (VPSS). The Ventrolla Perimeter Sealing Technique (VPSS) comprises a variety of draught-proofing aspects that work together to seal the entire perimeter on the sash window. These consist of the sealing method mounted over the top sash, possibly inside the sash itself or in a few parting bead https://vasilievichb580aab3.levitra-wiki.com/user