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 19 Non-domestic heating/cooling equipment, nes; non-electric water heaters 84 19 50 Heat exchange units 84 19 50 00 Heat exchange units Commodity Code Description 84 19 50 00 000 Heat exchange units
