G – Ventrolla Perimeter Sealing Technique (VPSS). The Ventrolla Perimeter Sealing Technique (VPSS) comprises several draught-proofing things that get the job done jointly to seal all the perimeter on the sash window. These incorporate the sealing technique set up over the best sash, both within the sash alone or in some parting bead https://joschkam158xcd5.wikifordummies.com/user