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To maintain proper combustion efficiency, operators can adjust the fuel/air mix. This adjustment is crucial because the right balance of fuel and air ensures complete combustion, which maximizes energy output and minimizes the production of pollutants and unburned fuel. If the mixture is too rich (excess fuel), it can lead to incomplete combustion, resulting in higher emissions of carbon monoxide and other harmful compounds. Conversely, if the mixture is too lean (excess air), it can lead to inefficient combustion and loss of heat, decreasing overall performance.

The fuel/air mix directly influences the combustion process, making it the most vital factor that operators can control to optimize efficiency. Adjustments to this mix can be made through the control systems of the boiler, allowing for real-time tuning based on varying load conditions and fuel specifications.

Other factors such as boiler size, heat exchanger design, and piping layout are important for the overall functionality and efficiency of a boiler system but do not have the same immediate impact on combustion efficiency as the fuel/air mix.