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Carbon monoxide in flue gas

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MAD
MAD Member Posts: 2
in Gas Heating
What is the max level of carbon monoxide in flue gas for natural gas boiler with category 1 vent.

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  • Tim McElwain
    Tim McElwain Member Posts: 4,657
    edited February 2012
    The ANSI standard

    allowable is 400 ppm. We strive however to keep it below 100 PPM for both gas and oil. The lower the better.
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