VELUX Support - Sun tunnel for flat roofs
Accessories for flat roof sun tunnels
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 Customer Service by clicking below.
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 Customer Service by clicking below.
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