What effect does increasing the air input to clean up the fire have?

Increasing the air input to the combustion process typically enhances the efficiency of the fire. When more air is introduced, it provides additional oxygen that facilitates the complete combustion of fuel. This process often results in a more vigorous and hotter flame.

As the combustion temperature rises due to the additional oxygen allowing for more complete burning of the fuel, it leads to an increase in stack temperature. Higher temperatures in the stack indicate that the combustion process is producing more heat energy, which is an essential aspect of effective heating. Therefore, the correct understanding of the relationship between increased air input and stack temperature is that the addition of more air contributes to a higher stack temperature, ultimately optimizing the combustion process for efficiency and reducing emissions.