Used 6" Diameter Indirect gas fired calciner. Manufactured by Harper Electric Furnace Corp. Model GU-6D60-RTA-24. Max temp 2400F. Max RPM 10. 6"D x 10'L HT-Alloy SS tube. (3) burners. Includes gas train and fresh air blower. Acrison Variable Speed feeder with auger. Enclosed hoods and bellows with Nitrogen purge. Includes spare tube. Serial #AT044.