What symbols, acronyms, and abbreviations does this part use?

The following symbols, acronyms, and abbreviations apply to this part: CFR Code of Federal Regulations. CH 4 methane. CO carbon monoxide. CO2 carbon dioxide. DEF Diesel exhaust fluid. EEFM Emergency equipment field modification. EPA Environmental Protection Agency. FEL Family Emission Limit. g/kW-hr grams per kilowatt-hour. HC hydrocarbon. ISO International Organization for Standardization (see www.iso.org ). kW kilowatts. N 2 O nitrous oxide. NIST National Institute of Standards and Technology. NMHC nonmethane hydrocarbons. NO X oxides of nitrogen (NO and NO 2 ). NTE not-to-exceed PM particulate matter. rpm revolutions per minute. SAE Society of Automotive Engineers. SCR Selective catalytic reduction. SEA Selective enforcement audit. THC total hydrocarbon. THCE total hydrocarbon equivalent. TRU transportation refrigeration unit. U.S.C. United States Code. [69 FR 39213, June 29, 2004, as amended at 74 FR 56509, Oct. 30, 2009; 77 FR 34148, June 8, 2012]