Size W870 x H870mm - Can be installed in either portrait or landscape positionRequires custom-made flashing (not supplied by VELUX)High-Performance Double Glazing (with laminated safety pane as standard to meet AS1288)NEAT coating on the exterior pane keeps glass cleaner for a longerBlocks approximately 70% radiant heat & approximately 99% harmful UVBAL 40 Bushfire Rating (Skylight only. Custom-made flashing required)Suitable for flat roofs, the FCM Skylight is a cost effective way to provide natural daylight to buildings with flat roofs. Ideal as an alternative or to replace inefficient plastic domes, the laminated safety glass will not fade or discolour and has been tested for hail resistance. For roof pitches 0-60 degrees. VELUX recommends FCM is installed with a slight pitch (e.g. 3-5°) to help reduce water ponding on the glass.