Furnace, Steam Plant, and Drying Equipment; and Nuclear Reactors (FSG 44) 6 rows found FSC 4410 - Industrial Boilers FSC 4420 - Heat Exchangers and Steam Condensers FSC 4430 - Industrial Furnaces, Kilns, Lehrs, and Ovens FSC 4440 - Driers, Dehydrators, and Anhydrators FSC 4460 - Air Purification Equipment FSC 4470 - Nuclear Reactors