A streamlined casing containing the cylindrical duct built to carry the exhaust gases from boilers or diesel engines above the superstructure.
Isigqubuthele esicuthekileyo esiqulathe umbhobho ebusilinda esakhelwe ukuphatha umeya omdaka ukusukela kwibyiler okanye injinizedizile ngaphezu kwesakhiwo esiphezulu.