What type of fan is designed to pull hot combustion gases out of a boiler?

The induced draft fan is specifically designed to handle the removal of hot combustion gases from a boiler. Its primary function is to create a negative pressure within the boiler system, which effectively draws the hot gases from the combustion process through the exhaust stack. This helps maintain an optimal combustion environment by ensuring that gases do not accumulate within the boiler, thereby promoting efficient operation and preventing potential hazards.

Induced draft fans are strategically placed at the flue gas outlet and operate at a high-temperature tolerance to manage the extreme conditions typically encountered during the combustion of fuels. This design is crucial for ensuring that the combustion process is efficient and that harmful emissions are properly vented out of the system.

Other types of fans, such as the forced draft fan, are employed to push fresh air into the combustion chamber to enhance the burning of fuel, but they do not facilitate the removal of exhaust gases. The vane axial and tube axial fans are generally used in different applications like ventilation, air conditioning, and cooling but are not specifically designed for the challenging conditions associated with combustion gases in a boiler.