C – Parting bead. There are 2 parting beads positioned on both sides with the sash box, working vertically from top to bottom in between the sashes. Every fifty percent segment of a Ventrolla parting bead includes a draught-proofing system that faces the adjacent sash, forming a snug weather conditions seal.  a long, narrow https://banksycleaneroncanvaspain21097.post-blogs.com/56615914/sash-window-draught-proofing-no-further-a-mystery