How Much Excess Air Should A 95% Furnace Have? - HVAC - DIY Chatroom Home Improvement Forum


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Old 06-21-2013, 05:08 PM   #1
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how much excess air should a 95% furnace have?


Running propane in a 95% furnace.
How much O2 should be in the flue gas for best efficiency and safety?

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Last edited by taxmantoo; 06-21-2013 at 05:46 PM.
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Old 06-21-2013, 07:04 PM   #2
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how much excess air should a 95% furnace have?


6-9% O2 and stable.
If the CO rises over time and the O2 falls you went too far.

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Old 06-21-2013, 07:10 PM   #3
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how much excess air should a 95% furnace have?


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