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Extension pieces Extension tunnel ZTR is recommended for installation with Rigid Tunnel TWR or TLR in case the distance from top edge of batten to ceiling finish level is over 1.85 m. ZTR in combination with TWR or TLR can be used for tunnel lengths of up to 6 m.
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Ventilation outlet
Ventilation outlet ZTV supplements the existing ventilation in the room. The ZTV can be installed with models TWR and TWF Sun tunnels only.
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