G – Ventrolla Perimeter Sealing System (VPSS). The Ventrolla Perimeter Sealing Method (VPSS) comprises many draught-proofing aspects that work with each other to seal the whole perimeter of the sash window. These include things like the sealing technique set up higher than the top sash, both in the sash alone or in some https://ammonq778lzk0.tdlwiki.com/user