气幕空气以必定速度从条缝形孔口喷出时，构成一股平面射流。如在其对面设置条缝形吸风口吸入这股气流，在吹、吸风口之间就会构成一道象帷幕一样的气流。运用这种吹吸气流自身所具有的动量间隔气流两侧空气的安装称为气幕。
When the air curtain air is ejected from the slotted orifice at a certain speed, it forms a plane jet. If a slit suction port is set on the opposite side to inhale the air flow, a curtain-like air flow will be formed between the blowing and suction ports. The installation of the momentum interval air on both sides of the air flow with this blowing and sucking air flow is called the air curtain.
装设在建筑物进出口的气幕称为大门空气幕。大门空气幕能够避免室外风、灰尘、昆虫、污染空气和臭味侵入室内，添加建筑物的热（冷）损失落，而且无妨碍人和物的经由。大门空气幕在人员车辆进出一再的工业厂房、冷藏库、百货公司、剧院等处获得了普及运用。在民用建筑中大多采用上部送风的上送式,在工业建筑中多采用下送式和侧送式。气幕也用于部分地址节制污染物松散，作为这种用处的安装称为气幕间隔或吹吸式排风罩，在大型酸洗槽、锻造车间落砂和大型工件油漆等出产进程中已良多采用。与传统的部分排风罩比拟，它的动力耗费少，污染节制结果好，无妨碍出产操作。
The air curtain installed at the entrance and exit of the building is called the door air curtain. The door air curtain can prevent outdoor wind, dust, insects, polluted air and odor from intruding into the room, add heat (cold) loss to the building, and do not hinder the passage of people and things. The door air curtain has been widely used in industrial factories, refrigeration stores, Department stores, theatres and other places where people and vehicles come in and out repeatedly. In civil buildings, the upper air supply is mostly used, while in industrial buildings, the lower air supply and side air supply are mostly used. Air curtain is also used to control loose pollutants at some sites. As an installation for this purpose, it is called air curtain interval or Blow-Suction exhaust hood. It has been widely used in the production process of large pickling tank, sand drop in forging workshop and paint for large workpieces. Compared with the traditional part of the exhaust hood, it has less power consumption, good pollution control results and no obstruction to production operation.
风的大小和倾向是不时改动的，因此自然通风的通风结果不不变。然则自然通风不用耗动力，是一种经济的通风办法。
The size and tendency of the wind change from time to time, so the ventilation result of natural ventilation remains unchanged. However, natural ventilation does not consume power and is an economical ventilation method.
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