Natural ventilation does not require mechanical systems to move outdoor air. Natural ventilation is the intentional passive flow of outdoor air into a building through planned openings (such as louvers, doors, and windows).Mechanical ventilation is often provided by equipment that is also used to heat and cool a space. Mechanical ventilation systems may include supply fans (which push outdoor air into a building), exhaust fans (which draw air out of a building and thereby cause equal ventilation flow into a building), or a combination of both. Mechanical ventilation is the intentional fan-driven flow of outdoor air into a building.The intentional introduction of outdoor air is usually categorized as either mechanical ventilation, natural ventilation, or mixed-mode ventilation (hybrid ventilation). Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants it can also be used to control indoor temperature, humidity, and air motion to benefit thermal comfort, satisfaction with other aspects of the indoor environment, or other objectives. Ventilation is the intentional introduction of outdoor air into a space. Windcatchers are a form of natural ventilation. Intentional introduction of outside air into a space An ab anbar (water reservoir) with double domes and windcatchers (openings near the top of the towers) in the central desert city of Naeen, Iran.
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