U3 – Double Glazed - Energy-Saving Glass construction from outside to inside = 4H-Tg16Ar-4T - The outer pane is a 4mm toughened glass, 16mm warm TGI spacer filled with inert Argon gas, 4mm centre pane which is toughened complete with a low emission coating.

Glass construction from outside to inside = 4H-Tg15Ar-33.2T - The outer pane is a 4mm toughened glass, 15mm warm TGI spacer filled with inert Argon gas, The 6.8mm internal pane is an anti-burglary class of laminate 33.2 (class P2A, EN 356,1(B)1 wg EN 12600), complete with a low emission coating.

Glass construction from outside to inside = 4HS-Tg10Kr-4HT-Tg8Kr-33.2T - The outer pane is a 4mm toughened glass with an easy maintenance layer, 10mm warm TGI spacer filled with inert Krypton gas, 4mm centre pane which is toughened with a low emission coating, 8mm Warm TGI spacer filled with inert Krypton gas, The 6.2mm internal pane is an anti-burglary class of laminate 33.2 (class P2A, EN 356,1(B)1 wg EN 12600), complete with a low emission coating.

Glass construction from outside to inside = 4HO-Tg14Ar-33.1T. The outer pane is a 4mm toughened ornamental and obscure glass, 14mm warm TGI Spacer filled with inert Argon gas, 6.4mm internal laminated pane with a low emission coating.