2821 Manufacture of ovens, furnaces and furnace burners

28.21.1 Ovens and furnace burners and parts thereof
28.21.11 Furnace burners; mechanical stokers and grates; mechanical ash dischargers and the like
28.21.12 Industrial or laboratory furnaces and ovens, non-electric, including incinerators, but excluding bakery ovens
This subcategory also includes:
- incinerators
This subcategory excludes:
- non-electric bakery ovens, see 28.93.15
28.21.13 Industrial or laboratory electric furnaces and ovens; induction or dielectric heating equipment
28.21.14 Parts of furnace burners, furnaces and ovens
28.21.9 Sub-contracted operations as part of manufacturing of ovens, furnaces and furnace burners
28.21.99 Sub-contracted operations as part of manufacturing of ovens, furnaces and furnace burners