Thats a pretty good average, mate but each appliance has its own CO2 settings available from the boiler manufacturer. Settings generally range between 10.5% and 12% CO2.
John
CO2 (Carbon Dioxide) is not a dangerous gas, 11% is text book for most oil burners
CO (Carbon Monoxide) IS dangerous however and is mesured in parts per million (ppm) this is the figure on your print out that you should be looking at on an oil burner less than 80ppm is desireable, however on older boilers the CO level can reach 200-300ppm
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