VELUX sun tunnel 1200mm extension section for use with rigid 14 inch diameter sun tunnel. Extension section available Flexible installation Easy to fit Suitable with rigid sun tunnels. The 14" rigid tunnel can be extended with extension section ZTR in lengths of 600 mm or 1200 mm up to a maximum of 6.0 m, which allows increased installation flexibility. Features & Benefits: Bring daylight into spaces far from the roof top with the rigid tunnel extension sections. Reflective inner coating with 98% reflection rate maximises the amount of natural light that enters the room. Clips provided so no screws are required making installation straightforward. Allows sun tunnel to be extended up to 6m if multiple extensions are used. Guarantee: 10 years