What is a good range for excess air when using a combustion analyzer?

The answer indicating a range of 35-50% for excess air when using a combustion analyzer aligns with standard practices in combustion efficiency monitoring. In combustion processes, excess air is the amount of air supplied beyond what is necessary for complete combustion of the fuel. A range of 35-50% indicates a balance that allows for efficient combustion while minimizing unburned fuel and emissions.

Excess air levels within this range help to ensure that combustion is occurring effectively, which can lead to optimal operation of combustion equipment, reduced emissions of harmful pollutants, and improved energy efficiency. Operating at too low an excess air level could result in incomplete combustion, leading to increased carbon monoxide emissions and potentially hazardous conditions.

Other ranges of excess air, such as those given in the remaining answer choices, may not account for optimal combustion conditions and could lead to inefficiencies or increased emissions, underscoring the importance of the 35-50% range for clean and efficient performance.