C – Parting bead. There are two parting beads positioned on each side in the sash box, operating vertically from major to bottom involving the sashes. Each half segment of a Ventrolla parting bead includes a draught-proofing technique that faces the adjacent sash, forming a comfortable weather conditions seal.  Sadly, plastic cannot replicate the https://juliaf071ksw3.prublogger.com/34922172/top-latest-five-sash-window-draught-proofing-urban-news