G – Ventrolla Perimeter Sealing Method (VPSS). The Ventrolla Perimeter Sealing Process (VPSS) comprises many draught-proofing elements that get the job done alongside one another to seal all the perimeter of the sash window. These involve the sealing process installed previously mentioned the highest sash, both in the sash by itself or in https://steveq740kuc6.bimmwiki.com/user