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Posted by Sunup on February 08, 2002 at 20:48:26:
I have read that the % of carbon dioxide considered desirable in the flue gas of a gas fired furnace is 10%. If coal, oil, or wood was the fuel, I suspect the % of CO2 would be higher than 10%. What I am wondering is, if there is a limit to the desirable amount on any type of fuel. Is it "the more CO2 the better"? And if not, what would cause too high a reading on the CO2?