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 and 80% Fan Assist Equipment

 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