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　　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.

　　裝設(shè)在建筑物進(jìn)出口的氣幕稱為大門空氣幕。大門空氣幕能夠避免室外風(fēng)、灰塵、昆蟲(chóng)、污染空氣和臭味侵入室內(nèi)，添加建筑物的熱（冷）損失落，而且無(wú)妨礙人和物的經(jīng)由。大門空氣幕在人員車輛進(jìn)出一再的工業(yè)廠房、冷藏庫(kù)、百貨公司、劇院等處獲得了普及運(yùn)用。在民用建筑中大多采用上部送風(fēng)的上送式,在工業(yè)建筑中多采用下送式和側(cè)送式。氣幕也用于部分地址節(jié)制污染物松散，作為這種用處的安裝稱為氣幕間隔或吹吸式排風(fēng)罩，在大型酸洗槽、鍛造車間落砂和大型工件油漆等出產(chǎn)進(jìn)程中已良多采用。與傳統(tǒng)的部分排風(fēng)罩比擬，它的動(dòng)力耗費(fèi)少，污染節(jié)制結(jié)果好，無(wú)妨礙出產(chǎn)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.

　　風(fēng)的大小和傾向是不時(shí)改動(dòng)的，因此自然通風(fēng)的通風(fēng)結(jié)果不不變。然則自然通風(fēng)不用耗動(dòng)力，是一種經(jīng)濟(jì)的通風(fēng)辦法。

　　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.