Natural ventilation is the use of natural forces, including both wind and thermal buoyancy, to regulate a building's indoor climate. These forces are created by temperature differences between the interior and exterior environment, thermal displacement within the building and winds around the building. Buildings utilising natural ventilation systems take advantage of the fact that warm air rises by allowing it to escape through vents, lowering the internal temperature.
The air inside a naturally ventilated building is kept fresh by controlling air change, typically by using windows in the building's facade and/or roof. Ventilation is achieved by automatically opening and closing windows depending on conditions inside and outside the building and the need for fresh air.
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