G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing Method (VPSS) comprises a variety of draught-proofing aspects that do the job collectively to seal the entire perimeter of the sash window. These include the sealing method set up over the top sash, both within the sash by itself or in a https://leopoldot285wzs3.blog2news.com/profile