G – Ventrolla Perimeter Sealing Program (VPSS). The Ventrolla Perimeter Sealing Process (VPSS) comprises various draught-proofing aspects that do the job collectively to seal your complete perimeter from the sash window. These incorporate the sealing procedure installed over the highest sash, possibly in the sash itself or in a few parting bead struggling https://bobe680ywt0.blog4youth.com/profile