What could excessive air supply lead to in an oil burner?

Excessive air supply in an oil burner can indeed lead to incomplete combustion. When an oil burner receives too much air, it disrupts the ideal air-to-fuel ratio necessary for complete combustion. This imbalance can prevent the fuel from burning efficiently, resulting in the formation of unburned hydrocarbons, soot, and other byproducts. Incomplete combustion not only reduces the efficiency of the burner but can also lead to increased emissions, which are harmful to the environment. Proper air supply is crucial for a clean and efficient combustion process, ensuring that the fuel burns completely and moves towards optimal performance.