G – Ventrolla Perimeter Sealing Process (VPSS). The Ventrolla Perimeter Sealing Process (VPSS) comprises various draught-proofing factors that operate alongside one another to seal your entire perimeter from the sash window. These incorporate the sealing program installed over the best sash, either within the sash itself or in certain parting bead dealing with https://kingw725ruv1.blogspothub.com/profile