Light kit (ZTL)
A light kit can be added at any time. It lets you turn on your sun tunnel – even at night. The kit is supplied with a low-energy 4W LED light bulb (~40W) which is hidden in the tunnel behind a frosted pane, This bulb provides a long lifetime of dependable light (approx. 18 years). The light kit fits both 25 cm and 35 cm rigid and flexible sun tunnels. For more information, or to purchase the light kit, please contact VELUX Support by clicking here.

Low u-value kit (ZTB)
A double-glazed pane made of polycarbonate and an additional seal in the ceiling ring improve the thermal insulation of the daylight spot. Both are attached directly to the diffuser behind the actual diffuser pane - for highly insulating quadruple glazing in the interior. For more information, or to purchase the low u-value kit, please contact VELUX Support by clicking here.

Ventilation adaptor (ZTV)
The ventilation adapter supplements the ventilation of the room (additions required on site) and directs moist or used air to the outside (only for TWR 0K14). Pipe connection diameter 10cm. For more information, or to purchase the ventilation adaptor, please contact VELUX Support by clicking here.

Extension tunnel (ZTR)
If the distance between the ceiling and roof exceeds 170cm, we recommend extending the rigid tunnel with the extension tunnel ZTR. This gives a total length of up to 600cm. For more information, or to purchase the extension tunnel, please contact VELUX Support by clicking here.

Accessories for pitched roof sun tunnels