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 84.02 or 84.03 (for example, economis 84 04 10 Auxiliary plant for use with boilers of 84.02 or 84.03 Commodity Code Description 84 04 10 00 Auxiliary plant for use with boilers of 84.02 or 84.03 84 04 10 11 For use with boilers of heading 84.02 : Soot removers (soot blowers) 84 04 10 19 Other 84 04 10 20 For use with boilers of heading 84.03