FAKRO DMF-D U6 Secure 03K 70x70 Manual Flat Roof Window Features & Benifits Non-domed flat glass flat roof window Argon filled laminated anti-burglary triple glazed unit 150mm insulated kerb upstand Coefficient window U-Value 0.7 W/m²K Non-vented Class B fire resistance to EN-13501-1 Acoustic insulation Rw 34 dB Glass ConstructionGlass construction from outside to inside = 6H-Tg18Ar-4HT-Tg18Ar-44.2T = 6H - Toughened Glass, Tg18Ar - glazing cavity with a warm Tgi spacer and filled with inert gas (argon), 4HT - toughened glass with low emission coating, Tg18Ar - glazing cavity with a warm Tgi spacer and filled with iner gas (argon), 44.2T - Laminated P2A anti-burglary glass with low emission coating. Internal or External UseSuitable for roof pitches of 2-15° Specifications Finish: White PVC, Clear Glass Colour: White RAL 9010, RAL 9005 black edge and clear glass Cavity Size: 70x70 Size: 92x92 External frame size Guarantee Period: 10 years