G – Ventrolla Perimeter Sealing System (VPSS). The Ventrolla Perimeter Sealing System (VPSS) comprises various draught-proofing aspects that get the job done together to seal your entire perimeter on the sash window. These consist of the sealing technique set up earlier mentioned the very best sash, both inside the sash itself or in https://richardh690ska1.wikikali.com/user