In this particular case in point the new double glazed sash windows along with the retrofitting equally benefitted from a 4-eight-four Argon stuffed, low-E, toughened unit, and a white spacer bar. The only real big difference I suppose glazing smart was the sandblast glazing in the first sash. Hinged secondary https://tile-repair-and-restorati65161.life3dblog.com/26025767/new-step-by-step-map-for-energy-efficient-glazing-in-wc2e