The VELUX Flexible Sun Tunnel introduces light into naturally dark areas such as bathrooms, corridors and cupboards. Flexible sun tunnels are recommended for tunnel length of 0.4m to 1.5m . An easy to assemble diffuser kit comes complete with a frosted acrylic insulating pane and a standard, white ceiling trim ring too.. The sun tunnel comes with a Clear and Clean coating which keeps the glass cleaner for longer. Can be used for night time lighting with an optional low energy kit and rigid extensions are available for deeper roof structures. Suitable for roof pitches between 15°-60°. The sun tunnel comes with the VELUX 10 year guarantee.