In this particular specific case in point the new double glazed sash windows as well as the retrofitting both of those benefitted from a four-eight-4 Argon stuffed, small-E, toughened device, and a white spacer bar. The one variance I suppose glazing clever was the sandblast glazing in the original sash. https://beautyproducts78709.livebloggs.com/32464507/the-greatest-guide-to-acoustic-window-upgrades-in-covent-garden