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.

室外溫度較低、密度較大的空氣則從下部窗孔流入室內。室內外空氣溫差愈大(即密度差愈大)、上下窗孔高差愈大、窗孔面積愈大，則通風量也愈大。

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.

機械通風是以風機為動力形成空氣活動。機械通風不受自然條件的限制，能夠依據需求停止送風和排通風設備風，取得穩定的通風效果。在某些場所常兼用機械通風和自然通風。

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.

某些房間對空氣環境有較高的請求,不允許四周空氣流入，這些房間的機械送風量應大于機械排風量,使室內壓力大于大氣壓力。

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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