Which type of draft is generated by the operation of a fan, blower, or ejector?

Induced draft is the type of draft that is generated by the operation of a fan, blower, or ejector. In this system, the mechanical equipment actively pulls flue gases or air from the combustion chamber and exhausts them to the atmosphere, creating a negative pressure that draws in combustion air from the surrounding environment. This process is crucial in applications where improved efficiency and control of the combustion process are required, as it helps ensure complete combustion and reduces the risk of flue gas backflow into the appliance.

Induced draft systems are often used in heating appliances, industrial processes, and power generation to enhance performance and reliability. The use of mechanical devices to create the draft distinguishes it from natural draft, which relies on buoyancy or temperature differences to promote airflow. Understanding this concept is vital for ensuring that heating and ventilation systems operate efficiently and safely.