In addition to the tables shown so far, there is also Table 4 (Table E.1.1 c): Multipliers for utility gases of another specific gravity. Not shown here, but possibly needed if you are working at altitudes above 2,000 feet, is Table E.1.1 (d): Equivalent Orifice Sizes at High Altitudes (includes 4% input reduction for each 1,000 feet above sea level). It is found in NFPA 54 (2015), pages 54-139 and 54-140. It is also important to work closely with your local gas utility or propane provider for special considerations that may need to be made. It is important to understand that determining the required input does not end there. It is important that a combustion analysis be made using an electronic analyzer to ensure safe operation. Levels of carbon monoxide must be maintained on heating equipment at 100 partsper million (PPM) air free unless specified otherwise by the equipment manufacturer. ICM ICM/Sept/Oct 2015 19
ICM September-October 2015
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