C – Parting bead. There's two parting beads positioned on each side with the sash box, working vertically from top rated to bottom concerning the sashes. Every 50 % section of the Ventrolla parting bead includes a draught-proofing system that faces the adjacent sash, forming a cosy weather conditions seal.  Sash windows – what https://louisgandr.ampblogs.com/5-tips-about-sash-windows-you-can-use-today-72540711