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    Fresh Air (2 Posts)

  • charliechicago charliechicago @ 11:04 AM
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    Fresh Air

    I am installing a 45,000 BTU   %80 furnace in a small mechanical room in a finished attic and would like to bring in fresh air for combustion. Is there a calculation to find out what size pipe I need? Thanks, Mike
  • Tim McElwain Tim McElwain @ 2:31 PM
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    Do you have a copy

    of NFPA 54 National Fuel Gas Code? If so look in the "Air for Combustion" section. There should also be something in the I & O manual for the furnace.
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