Which type of draft is associated with fan assistance?

The type of draft associated with fan assistance is forced draft. A forced draft system utilizes mechanical fans to actively push air or flue gases through the combustion system, which enhances airflow and helps promote better combustion efficiency. In forced draft applications, the fan is typically located at the air intake side, creating positive pressure that forces air into the combustion chamber or furnace, thus ensuring a consistent supply of air for burning fuel.

In contrast, induced draft systems, while also using fans, focus on creating a negative pressure to pull flue gases out of the combustion space and through the exhaust system. Natural draft relies on the buoyancy of hot gases rising, and static draft refers to the pressure difference created by the resistance of air moving through ductwork without a fan's assistance. Understanding these definitions helps clarify why forced draft is specifically linked to fan assistance.