AKRO light tunnels enable illumination of all rooms in the building, even those which cannot be fitted with roof windows or vertical windows. Using the FAKRO light tunnels in a room devoid of daylight lets natural light inside for better illumination. In other rooms, the light tunnel can constitute an additional light source, enhancing the users comfort and saving energy. It carries daylight via the light transmitting tube. Sunlight is reflected from the walls of the flexible, reflective tube and is directed downwards to the diffuser. The diffuser which is fitted in the ceiling evenly distributes natural light, illuminating the room. FAKRO SFL Light Tunnel Features Suitable for pitches from 15 - 60deg and flat roofs Consists of an aluminium frame into which 4mm thick toughened glass is bonded. The light transmitting tube is fitted to the inside profile of the frame. The roofing element is made of aluminium sheet metal Illuminates natural light the space directly below the installation of light tunnels outer element e.g. attic or loft The entire structure is finished in grey-brown RAL 7022 which matches perfectly all standard colours of roof covering materials The advised maximum flexible tube length is 400cm for the 350mm diameter and 600cm for the 550mm diameter tube (for the lengths over 500cm hangers must be applied) Technical Tunnel diameter: 55cmTube length: 210cmFlashing Type: Slate roof covering Please note, this isn't supplied with a flashing kit and needs to be bought additionally.