42 14 00 Industrial Furnaces
42 14 23 Industrial Brazing Furnaces
42 14 13 Annealing Furnaces 42 14 16 Atmosphere Generators 42 14 19 Industrial Baking Furnaces 42 14 23 Industrial Brazing Furnaces 42 14 26 Industrial Calcining Furnaces 42 14 29 Industrial Heat-Treating Furnaces 42 14 33 Industrial Melting Furnaces 42 14 33.13 Ceramics and Glass Melting Furnaces 42 14 33.16 Ferrous Melting Furnaces 42 14 33.19 Non-Ferrous Melting Furnaces 42 14 36 Primary Refining Furnaces 42 14 43 Reactor Furnaces 42 14 46 Industrial Reheat Furnaces 42 14 53 Industrial Sintering Furnaces 42 14 56 Industrial Vacuum Furnaces