The induced draft fan is located between the boiler and which structure?

The induced draft fan is located between the boiler and the chimney, which is primarily responsible for pulling flue gases out of the boiler and ensuring that there is a proper draft for the combustion process. The function of the fan is to maintain an efficient airflow by removing combustion gases, which helps to maintain optimal pressure in the boiler and allows for better combustion efficiency.

In this arrangement, the chimney serves as an outlet for the exhaust gases, where the induced draft fan creates a negative pressure that assists in the emission of these gases into the atmosphere. This setup is crucial for maintaining safe and efficient operation, as it ensures that combustion byproducts are effectively vented away from the boiler and that fresh air for combustion is drawn in adequately.

Other structures listed, such as the exhaust stack, combustion chamber, and fuel tank, do not fulfill the role that the chimney does in this context. The exhaust stack may be part of the overall system but isn't where the induced draft fan is primarily positioned. The combustion chamber is part of the boiler itself, where the combustion action occurs, while the fuel tank serves to store fuel but does not relate to the exhaust of flue gases.