Get Steamy with the Class 5 Boiler Exam 2026 – Ignite Your Career Potential!

A forced draft fan is crucial in the combustion process of a boiler system. Its primary role is to deliver air into the combustion chamber, which is essential for the efficient burning of fuel. By pushing a controlled amount of air into the system, the forced draft fan helps maintain optimal combustion conditions, leading to better efficiency, reduced emissions, and improved overall performance of the boiler.

In the context of boiler operations, the quality and quantity of air supplied by the forced draft fan directly influence the combustion process, affecting both fuel efficiency and safety. Proper airflow helps achieve the right air-to-fuel ratio, which is necessary for complete combustion and maximizing energy output while minimizing unburned fuel and harmful emissions.

When comparing the role of the forced draft fan to the other choices, it is clear that the functions differ significantly. For instance, the fan that removes exhaust fumes pertains to the flue gas system and is not associated with promoting combustion. Similarly, cooling the boiler system is a different function entirely, usually associated with circulation pumps or cooling systems, and circulating steam in the pipe system is relevant to steam management rather than the combustion process. Thus, option B distinctly outlines the essential function of the forced draft fan within the broader context of boiler operations.