Reduction by the reducing gas is located in the bottom of the endless belt wind tube into the reduction furnace, facing the upward movement of the charge dropped.
The reduced gas enters the restore furnace through a ring duct located at the bottom of the reduction belt and moves upward towards the lowering furnace material.
The reduction gas enters the reduction furnace through the annular air duct at the bottom of the reduction belt, and moves upward against the falling furnace charge.<br>