C – Parting bead. There are 2 parting beads positioned on each side on the sash box, working vertically from top rated to base in between the sashes. Every single half segment of the Ventrolla parting bead includes a draught-proofing system that faces the adjacent sash, forming a comfortable climate seal.  Because 1923, WindowPRO https://enricou481bzx1.wikijournalist.com/user