DEC-C U8 Fakro Flat Roof Z-Wave Electric Clear Quadruple Glazed Opening Dome & Kerb - 900mm x 900mm Please note this is an anti-burglary quadruple glazed unit with a single durable polycarbonate dome. This is a Z-Wave wireless electric opening dome & kerb. Description The energy efficient FAKRO DEC-C U8 has perfect thermal insulation parameters. Special coatings on the outer and inner surface of the dome protect it against UV radiation. The domed flat roof window is intended for installation in a flat roof with a pitch between 2° to 15°. A specially profiled covering materials under the drip cap of the frame facilitates the finishing of the window connecting with the roofing material. The flat roof window can be also mounted on an additional base with a height of 15cm, which raises the window and allows it's installation eg. in green or living roofs. Dimensions Dome size: 900mm x 900mm. Minimum roof opening: 900mm x 900mm. Maximum roof opening: 950mm x 950mm. uValue: 1.2W/m²k. Upstand: 150mm.