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You will need a copy of the International Fuel Gas Code to start with. Turn to table 402.2 to get the BTU ratings for the appliances being installed, then turn to section 402.4 for the formulas to calculate your demand in cubic feet per hour, then turn to tables 402.4 (1-33) and choose the pipe material you want to use, the design pressure, and length of pipe to find the pipe size.

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