G – Ventrolla Perimeter Sealing Process (VPSS). The Ventrolla Perimeter Sealing Method (VPSS) comprises several draught-proofing features that perform jointly to seal the whole perimeter on the sash window. These consist of the sealing method mounted above the best sash, both within the sash by itself or in certain parting bead facing the https://margaretg876fdu6.wikiworldstock.com/user