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An inline exhaust fan is best defined as a fan that is mounted inline (inside or connected to ducting) that is used for extraction purposes. An inline fan does not sit directly on the plasterboard or ceiling, instead it is typically located inside the attic or roofspace a little bit further away from the bathroom.
Consequently, what is the difference between ventilation fan and exhaust fan?
The difference between an exhaust fan and a fresh air fan lies in their application. Whereas an exhaust fan helps in throwing out the air that is inside the house or the area that it is placed in, fresh air fan brings in fresh air from outside, into the area where it is placed.
Then, how does a ventilation fan work?
Exhaust fans work by sucking hot or humid air out of a small, localised area, allowing fresh air to enter from elsewhere (perhaps a doorway or vent) in order to replace it. The warm air that's drawn out using an exhaust fan is then pulled through a ducting system and expelled outside.
Centrifugal fans use the kinetic energy of the impellers to increase the volume of the air stream, which in turn moves against the resistance caused by ducts, dampers and other components. Centrifugal fans displace air radially, changing the direction (typically by 90°) of the airflow.