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NFPA 31, Standard for the Installation of Oil-Burning Equipment is the benchmark for the correct installation of boilers, air heaters, and other liquid fuel-burning equipment, and their fuel supplies. Designers, contractors, and installers rely on this Standard for guidance that protects property and building occupants by ensuring a fire-safe installation. Authorities Having Jurisdiction (AHJs) and insurance underwriters depend on NFPA 31 requirements to verify the safety of installations in industrial, commercial, and residential occupancies.