Section 16 Machinery and mechanical appliances; electrical equipment; parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers and parts and accessories of such articles 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 04 Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economisers, superheaters, soot removers, gas recoverers); condensers for steam or other vapour power units 84 04 10 - Auxiliary plant for use with boilers of heading 84.02 or 84.03 Commodity Code Description 84 04 10 00 - Auxiliary plant for use with boilers of heading 84.02 or 84.03