With this unique example The brand new double glazed sash windows and also the retrofitting both of those benefitted from the 4-8-4 Argon loaded, very low-E, toughened unit, as well as a white spacer bar. The only distinction I suppose glazing clever was the sandblast glazing in the original sash. https://semiflushceilinglights70502.bloggerswise.com/32532898/retrofit-double-glazing-in-london-wc2e-things-to-know-before-you-buy