Which type of fan operates in significantly higher temperatures and deals with boiler ashes?

The induced draft fan is specifically designed to handle high-temperature environments, such as those found in boiler systems. This type of fan plays a crucial role in drawing flue gases out of the boiler, which may contain ash and other combustion by-products. Because of its purpose, it is built to withstand elevated temperatures and corrosive materials, ensuring it functions efficiently even in these harsh conditions.

In contrast, centrifugal fans and axial-flow blowers generally operate in environments with lower temperature ranges and are not specifically constructed for the rigors associated with boiler ashes. Centrifugal fans are primarily used where high pressure is required but are not typically employed directly in the high-temperature zones associated with boiler applications.

Vane-axial fans, while they can move significant volumes of air, also do not operate under the same high-temperature conditions as induced draft fans, making them less suitable for applications involving boiler ashes and extreme thermal environments. Thus, the induced draft fan stands out as the ideal choice for operating effectively at higher temperatures and dealing with the challenges posed by boiler ashes.