The FAKRO range of flat roof windows includes models with clear and opaque polycarbonate domes as well as a dome-free option. All offer excellent thermal qualities as their multi-chamber PVC frames are filled with polystyrene insulation. Energy-efficient U6 or U8 triple and quadruple-glazed units are also available to provide a glazing U-value as low as 0.3 W/m2K. Added security is achieved through use of an internal pane of P2A anti-burglary glass and the window design provides a glazing area up to 16% larger than other manufacturers’ windows. Non-standard sizes are routinely manufactured to match those of old skylights requiring replacement.