O₂ in flue gases – what it indicates about excess air

What O₂ indicates

Measuring oxygen in flue gases helps us estimate how much extra air was involved in the combustion process.

High O₂

This may signify excessive air and increased losses.

Very low O₂

This may be associated with insufficient air and increased CO.

Important

The value must always be evaluated in conjunction with CO, flue gas temperature, and the specific burner specifications.