Natural ventilation is the intentional flow of outdoor air through an enclosure under the influence of wind and thermal pressures through controllable openings. It can effectively control both temperature and contaminants, particularly in mild climates. Temperature control by natural ventilation is often the only means of providing cooling when mechanical air-conditioning is not available. The natural ventilation through openings such as doors, windows and ventilation depends on direction and velocity of the wind prevailing outside the building. The provision of ventilation is essential while designing buildings to maintain health conditions. It also depends on the size and position of the openings. The buildings having maximum natural ventilation are considered the best buildings. The arrangement, location, and control of ventilation openings should combine the driving forces of wind and temperature to achieve desired ventilation rate and good distribution of fresh air through the building.
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