G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing Procedure (VPSS) comprises several draught-proofing elements that work with each other to seal the complete perimeter from the sash window. These consist of the sealing method installed above the best sash, possibly in the sash itself or in certain parting bead facing https://audreyh680xtr9.csublogs.com/profile