What type of draft system mixes both forced and induced draft?

The type of draft system that combines both forced and induced draft is known as a balanced draft. In this system, a forced draft fan is used to supply air into the combustion area, while an induced draft fan removes the flue gases from the system. This balance between the two types of draft helps maintain optimal combustion conditions and increases efficiency.

A balanced draft system ensures that the air supplied for combustion is adequate while effectively removing the combustion gases, preventing excessive negative or positive pressure in the furnace. This type of system is often used in larger industrial applications where precise control over combustion is necessary.

Other draft systems, such as negative draft, typically involve only the removal of flue gases without the assist of a forced air system, while stack draft relies on the natural buoyancy of hot gases to create draft without any mechanical assistance. Pressure draft systems also involve forced mechanisms but do not integrate both forced and induced components as in a balanced draft.