G – Ventrolla Perimeter Sealing Method (VPSS). The Ventrolla Perimeter Sealing Method (VPSS) comprises a variety of draught-proofing factors that operate jointly to seal all the perimeter with the sash window. These incorporate the sealing program installed earlier mentioned the highest sash, possibly within the sash by itself or in some parting bead https://howardl086gxi9.yourkwikimage.com/user