In the context of a boiler, what does "draft" refer to?

"Draft" in the context of a boiler specifically refers to the flow of air through the combustion chamber and flue. This flow is essential for the combustion process as it provides the necessary oxygen for fuel to burn effectively. A proper draft ensures that exhaust gases are effectively expelled from the boiler, allowing for efficient operation and maintaining safety standards.

Effective draft is crucial because insufficient draft can lead to incomplete combustion, increased emissions, and potentially harmful conditions. On the other hand, excessive draft can lead to overheating and can affect the performance of the boiler. Understanding draft is vital for managing boiler efficiency and safety in heating systems.