A ceiling exhaust fan is one of the most popular methods of ventilating a room. When choosing a ceiling exhaust fan, consider the capacity (airflow) required – usually based the room size and its use. Secondly what hole-size is required (especially if replacing an existing fan), and thirdly does the fan need to be able to connect to duct work.
Ceiling Exhaust Fan Definition: A ceiling exhaust fan, as the name suggests, is an exhaust fan that is mounted on a ceiling. These fans expel air upwards through the ceiling and can be exhausted into the roof cavity or ducted to be exhausted to the outside.