2010-04 Venting of Residential Heating Appliances
2013-3-10 · Example: A 130,000 BTU oil-fired furnace is installed in the basement near a 40,000 BTU gas-fired hot water heater. Both units intend to utilize the same chimney flue for venting the exhaust. The installer must produce the math and/or reference charts from NFPA 54 (The National Fuel Gas Code) to verify that the chimney flue will be large
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