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-   -   how much excess air should a 95% furnace have? (http://www.diychatroom.com/f17/how-much-excess-air-should-95-furnace-have-182247/)

taxmantoo 06-21-2013 04:08 PM

How much excess combustion 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?

Marty S. 06-21-2013 06:04 PM

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

Marty S. 06-21-2013 06:10 PM

double post


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