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Outdoor installations must conform to local codes or, in the absence of local codes, with the following: USA: National Fuel Gas Code, ANSI Z223.1/NFPA 54 CAN: B149.1 Natural Gas & Propane Installation Code. AUST: Australian Standards Code AS: 5601 as well as the requirements of any local council, gas, electricity authority or other statutory regulation. When using an LPG supply system in an enclosure, ventilation must be provided. Gas vapour is highly explosive and can cause serious bodily inj