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NFPA 54 / ANSI Z223.1: National Fuel Gas Code (2021 Edition) is a comprehensive safety standard that establishes minimum requirements for the design, installation, operation, and inspection of fuel gas piping systems, appliances, and related equipment in residential and commercial buildings. It covers areas such as gas piping materials and sizing, installation practices, testing and maintenance, combustion air, and venting to help prevent hazards like fire, explosion, and carbon monoxide exposure.