Home Roofing & Ventilation Roof Windows & Accessories VELUX Sun Tunnels
The extension tunnel ZTR is used for extension of rigid sun tunnels TWR,TLR and TCR when the distance from roof to ceiling finish level exceeds 1.85 m. The tunnels of TWR,TLR and TCR can be extended with sections of ZTR up to a maximum of 6.0 m.