A cast house emissions recycle system for a blast furnace including a housing surrounding and enclosing the lower portion of the blast furnace and the tap holes and runners therefor and the hot metal ladle associated therewith, structure collecting the emissions from the housing, and a blower having an inlet duct communicating with the collecting structure and an outlet duct communicating with the cold air blast inlet to a hot blast stove for heating the air stream flowing therethrough and returning the heated air stream to the interior of the blast furnace; in an alternative construction, the output from the blower is connected to the combustion chamber of an associated hot blast stove as part of the fuel combustion air input thereto.