Ventilation is divided into natural ventilation and mechanical ventilation according to the motive force of air activity. Natural ventilation of ventilation equipment, ventilation power is the indoor and outdoor air temperature difference arising from the "hot" and outside the role of the wind generated by the wind". These two elements sometimes exist separately, sometimes at the same time.
Outdoor temperature is low, the density of air from the lower window into the room. The larger the indoor air temperature difference (i.e., the greater the density difference), the greater the height difference between the upper and lower window, the larger the area of the window, the greater the amount of ventilation.
Mechanical ventilation is driven by the fan to form air activity. Mechanical ventilation is not restricted by the natural conditions, can stop the supply of wind and exhaust ventilation equipment, according to the demand, to achieve a stable ventilation effect. Mechanical ventilation and natural ventilation are often used in some places.
Some rooms have a higher request on the air environment, not allowed to flow into the surrounding air, the room should be greater than the mechanical ventilation of the mechanical exhaust air, so that indoor air pressure greater than atmospheric pressure.
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