G – Ventrolla Perimeter Sealing Process (VPSS). The Ventrolla Perimeter Sealing Technique (VPSS) comprises numerous draught-proofing things that work together to seal all the perimeter of your sash window. These incorporate the sealing program mounted above the highest sash, either within the sash by itself or in some parting bead facing the best https://romains912bxt9.wikiexcerpt.com/user