How can the draft created by the fan be controlled?

Controlling the draft created by a fan is primarily done by adjusting the inlet dampers. Inlet dampers regulate the amount of air that enters the fan, which directly affects the fan's efficiency and the draft it produces. When dampers are partially closed, they restrict airflow, reducing the draft. Conversely, opening the dampers increases airflow, enhancing the draft. This method allows for precise control over the draft, making it an effective approach for maintaining optimal combustion conditions and improving system performance.

While changing fan speed can also affect the draft, the most direct and controllable method for draft regulation is through the use of inlet dampers. Altering the fuel type or modifying air temperature might influence overall combustion efficiency or system operation but does not provide the same level of immediate control over draft parameters as adjusting dampers does.