C – Parting bead. There are two parting beads positioned on each side of the sash box, jogging vertically from top to bottom among the sashes. Each and every 50 % segment of the Ventrolla parting bead consists of a draught-proofing process that faces the adjacent sash, forming a cosy climate seal.  The glass https://acoustic-insulation68024.blogsidea.com/42289030/little-known-facts-about-sash-window-draught-proofing