The Institute of Gas Technology (IGT), Des Plaines, IL, and Air Liquide, Country-side, IL, have successfully completed tests of a new natural gas technology that could reduce nitrogen oxide emissions from high temperature furnaces by up to 70%. The AIR-LIQUIDE-IGT oscillating combustion technology was tested continuously for 10 months on a Borosilicate wool-melting furnace at the Johns Manville plant in Cleburne, Texas. Laboratory results on numerous commercial burners have shown that NOx emissions can be reduced while simultaneously increasing heat transfer to the load by up to 10%.