Which device is typically used to create the draft required to counteract resistance from economizer tubes?

Induced draft fans are specifically designed to create the necessary draft within a boiler system to ensure efficient combustion and to counteract the resistance from economizer tubes. These fans work by removing flue gases from the boiler and creating a negative pressure within the combustion chamber, which ensures that air and combustion gases flow through the system correctly. By pulling gases through the economizer tubes, these fans help maintain optimal conditions for heat exchange, improving the efficiency of the overall system.

In contrast, blower fans typically push air into a system, rather than creating the draft needed for removing gases. Exhaust fans are mainly used in areas like ventilation but do not specialize in creating the necessary draft in a boiler system. Recirculation fans are intended for moving air within a system rather than managing the combustion gases or enhancing draft through economizer tubes.