An end-port regenerative furnace (10) includes a housing; a combustion chamber (14) within the housing; first and second regenerators (24, 26) each disposed to be in communication with the combustion chamber; and first and second lance assemblies (20, 22) adapted to inject pure fuel gas and pure oxygen concurrent into the half of the combustion chamber closest to a discharge end with a respective one of the first and second regenerators. The first and second regenerators are each constructed and arranged to alternate between a combustion mode and an exhaust mode for the combustion products circulating in the combustion chamber.