Even sashes that shift are meant to suit tightly and assist conserve Power. But after a while, the seal can use out and make the window less productive. Sashes have Distinctive patterns that assist hold the seal restricted. Draught proofing pile is lower drag and decreases friction, What this means https://banksy-thinking-monkey-ar11024.bloggactif.com/37432323/getting-my-sash-windows-to-work