G – Ventrolla Perimeter Sealing System (VPSS). The Ventrolla Perimeter Sealing Procedure (VPSS) comprises several draught-proofing things that function together to seal the entire perimeter of the sash window. These contain the sealing process put in previously mentioned the best sash, either in the sash by itself or in some parting bead dealing https://marlona726xgn0.blog-a-story.com/profile