What kind of system regulates the flow of air to and from a boiler?

The system that regulates the flow of air to and from a boiler is referred to as the draft system. This is essential for ensuring that the combustion process operates efficiently and safely.

In a boiler, the draft system creates a flow of air that is necessary for the combustion of fuel. It typically uses either natural or mechanical means to control the amount of air entering the combustion chamber and to facilitate the removal of exhaust gases. An adequate draft is crucial for maintaining positive combustion conditions, preventing back drafts, and ensuring complete combustion of the fuel, which maximizes efficiency and minimizes pollutants.

This system also plays a significant role in regulating the pressure within the boiler and ensuring that flue gases are properly vented outside the building. By maintaining proper airflow, the draft system helps to optimize the performance of the boiler while ensuring safety and compliance with relevant regulations regarding emissions and air quality.

Other systems mentioned, such as combustion, feedwater, and circulating systems, deal with different aspects of boiler operation but do not specifically regulate the airflow to and from the boiler as the draft system does.