G – Ventrolla Perimeter Sealing Method (VPSS). The Ventrolla Perimeter Sealing Method (VPSS) comprises several draught-proofing features that work collectively to seal all the perimeter of your sash window. These include the sealing method installed higher than the best sash, possibly in the sash itself or in a few parting bead struggling with https://mitchn901uka0.blogadvize.com/profile