Technical information Black line Tunnel inlet
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The BT tunnel series can be placed as a standalone side air inlet. But mounted on top of each other the BT inlets will work as a Tunnel inlet. One can put 2, 3, 4 or 5 BT inlets together. The BT series can be self opening or self closing. The self closing version has the big advantage of being completely closed even if the inlets are not synchronised.
Synchronisation of the inlets is easy with the fine tune screw.