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Acceptable Combustion Test Results 

It is very important to consult with the manufacturer or their literature to determine acceptable ranges of O2, CO, Stack Temperature, Steady State Efficiency, Smoke and Draft.   Requirements for NOx and SO2 emissions (if any exist) vary from local to local. 

The following ranges are generally considered acceptable for commercial/industrial units:

 Atmospheric Gas Fired Burners

 Oxygen (O2)                                                                 7% to 9% 

Stack Temperature (°F)                                                 325° to 500° 

Draft in Water Column Inches (WC”)                -.02 WC” to -.04 WC” 

Carbon Monoxide in Parts Per Million (ppm)    <100ppm - air free     

Gas Fired Power Burners                  

Oxygen (O2)                                                                 3% to 6% 

Stack Temperature (°F)                                                 275° to 500° 

Draft in Water Column Inches (WC”)                            -.02 WC” Overfire or PMI*

-.02 WC” to -.04 WC” Stack Draft 

Carbon Monoxide in Parts Per Million (ppm)     <100ppm - air free                  

Oil Fired Power Burners  

Oxygen (O2)                                                                 4% to 7% 

Stack Temperature (°F)                                                 325° to 600° 

Draft in Water Column Inches (WC”)                            -.02 WC” Overfire or PMI*

-.04 WC” to -.06 WC” Stack Draft 

Carbon Monoxide in Parts Per Million (ppm)    <100ppm - air free                     

Smoke                                                                            Zero or PMI (Bacharach smoke number) 

*Per Manufacturer’s Instructions