Includes
Complete Functioning Fuel Cell Power Units; Fuel Cells: Fuel Cell Assemblies or Modules; Fuel Cell Reactant Chambers; Fuel Feed Mechanism; Electrolyte Heaters; Heat Exchangers; and other internal components peculiar to, and used exclusively on or with, Fuel Cell Power Units classified in this class.

Excludes
Primary Batteries (FSC 6135); Secondary Batteries (FSC 6140); Generators and Generating Sets (FSC 6115); and items for which more suitable classes are specifically prescribed by the indexes and structure of the FSC.

Notes
This class includes items that are designed to produce an electromotive force directly from an oxidation-reduction type of chemical reaction. A complete power unit must include tanks, pumps, and associated control equipment, and requires a continuous, uninterrupted supply of liquid or gaseous fuel and oxidizers.

Possible NAICS Codes
334413 – Semiconductor and Related Device Manufacturing
335999 – All Other Miscellaneous Electrical Equipment and Component Manufacturing
335312 – Motor and Generator Manufacturing
336411 – Aircraft Manufacturing
541519 – Other Computer Related Services
457210 – Fuel Dealers
811310 – Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
334220 – Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
325120 – Industrial Gas Manufacturing