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
336411 – Aircraft Manufacturing
335312 – Motor and Generator Manufacturing
811310 – Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
457210 – Fuel Dealers
334515 – Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals
541519 – Other Computer Related Services
336310 – Motor Vehicle Gasoline Engine and Engine Parts Manufacturing
335910 – Battery Manufacturing