Induced draft fan (ID fan) is a type of fan used in industrial and commercial settings to move gas or air through a duct system. The fan works by drawing in air from outside the system and pushing it through the duct, generating a flow of air to the desired area. ID fans come in a variety of shapes and sizes, depending on the application and requirements of the system. For example, a large-scale industrial facility may need a larger and more powerful ID fan to move a large volume of air, while a smaller facility may require a smaller, more efficient fan. ID fans can be powered by electricity, gas, or steam, depending on the facility and purpose.