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The percent O2 in the flue gas is a measure of the combustion efficiency of the burner. The burner requires excess air to complete the combustion process. This amount of excess air is measured by measuring the O2 in the flue gas and plugging the results into the formula: [O2 / (20.9 - O2)] x 100 to determine the amount of excess air. 0% excess air is 100% combustion efficiency.

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