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.
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