what principle is used by exhaust fan
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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.
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hot air rises up that's why it is set up at the top. secondly for movement their must be a change in concentration this is done by the exhaust fans and hence the hot, dusty,humid air rusgea out.
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