G – Ventrolla Perimeter Sealing System (VPSS). The Ventrolla Perimeter Sealing Procedure (VPSS) comprises several draught-proofing aspects that perform collectively to seal the whole perimeter of the sash window. These include the sealing method installed above the top sash, possibly throughout the sash by itself or in a few parting bead dealing with https://emmad703ghi6.national-wiki.com/user