What happens to the combustion air supply when dirt accumulates on the burner fan blades?

When dirt accumulates on the burner fan blades, it disrupts the efficient operation of the fan, which is responsible for drawing in combustion air to support the burning of fuel. As dirt builds up, the fan's ability to draw in adequate volumes of air diminishes because the blades have to work harder to overcome the increased resistance caused by the accumulated dirt.

This decrease in airflow results in a reduced combustion air supply, which can lead to incomplete combustion, increased emissions, and potentially dangerous conditions in the heating system. The overall efficiency of the burner can also suffer as a result, which can affect both performance and safety. Maintaining clean burner fan blades is therefore crucial for optimal combustion and efficient operation of oil heating systems.