G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing System (VPSS) comprises a variety of draught-proofing features that work alongside one another to seal the complete perimeter of your sash window. These involve the sealing procedure set up over the best sash, possibly throughout the sash alone or in some parting https://actork876pfs0.dgbloggers.com/profile