ANSIANSI Z223.1National Fuel Gas Code (also NFPA 54).Referenced across 8 Anvilfield field guides. Field guides that apply ANSI Z223.1HVACHVACCombustion analysis field guideHVACGas furnace field guideHVACInfrared radiant heater field guideHVACUnit heater field guidePlumbingPlumbingGas piping sizing and install guidePlumbingPropane LP-gas system install guidePlumbingWater heater venting and combustion airLandscapingLandscapingOutdoor fire feature guide Often cited alongsideNFPA 54IFGCIRCNFPA 58NECNFPA 1 Compare your optionsGas furnace vs Electric furnaceHeat pump vs Gas furnaceGas tankless vs Electric tankless Browse all codes and standards