Extension tunnel ZTR
Extension tunnel ZTR is recommended for installations with TWR in which the distance from top edge of batten to ceiling finish level is more than 1.85 metre. ZTR is 90cm long, and considering a 3cm overlap at both ends, each ZTR can add to the total length of the tunnel by 84cm. ZTR in combination with TWR can be used for tunnel lengths of up to 6m.
Ventilation outlet ZTV
Ventilation outlet ZTV (only available for TWF/TWR) supplements the existing ventilation in the room. ZTV is fitted to the inside of the VELUX Sun tunnel Rooflight unit. The installation is completed with an insulated ventilation tube and a mechanical ventilator to be provided by the customer.
Light kit ZTL
Light kit ZTL provides the possibility of light 24 hours a day. The light kit can be installed at any time. Requires mains connections and a 23W low-energy bulb.
Trim ring ZTB
Trim ring ZTB is the internal ring that encircles the pane at ceiling level. The sun tunnel is delivered with a white trim ring as standard. Rings in mahogany, brass and brushed aluminimum effect finish can be ordered as an accessory.