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-   -   Combustion air for furnace (https://www.askmehelpdesk.com/showthread.php?t=425649)

  • Dec 16, 2009, 02:31 PM
    rstubler
    Combustion air for furnace
    I need to know, what is size required (duct size) for combustion on a furnace. It is a formula that you use, it is how many sguare inches for some many BTUs.

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