The main job of exhaust fans to pull air (primarily hot air) and throw it outside. Hence, you can see them close to the ceiling (this is where most of the hot air and fumes stays due to its low density) in kitchens, garages, bathrooms and even bedrooms.
Exhaust fans usually have very high rotating blades but some come with adjustable speed. A combination of a ceiling fan and an exhaust fan will cool down the room without an air conditioning unit.
The primary role of exhaust fans is providing ventilation. They function by sucking moist or hot air from an area, replacing it with fresh and cool air. The ducting system is significant in expelling out the warm or stale air. Hence, the stale and humid air is forced out through the exhaust vent, exiting the area.
The fans use electricity to operate. Some exhaust fans are installed with sensors that detect steam or humidity and automatically turn on. At the same time, others are fitted with a thermostat that senses the temperature changes and then operates accordingly.
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