A REVIEW OF SASH WINDOWS

G – Ventrolla Perimeter Sealing Procedure (VPSS). The Ventrolla Perimeter Sealing Procedure (VPSS) comprises many draught-proofing aspects that perform jointly to seal the complete perimeter of your sash window. These incorporate the sealing procedure installed earlier mentioned the highest sash, both in the sash itself or in a few parting bea