結構形式：

A級(ji)(ji)(ji)單(dan)(dan)向流罩(zhao)是一種提供A級(ji)(ji)(ji)單(dan)(dan)向流、創造局(ju)部(bu)高(gao)潔(jie)凈度環境的空(kong)氣(qi)凈化設備。其工(gong)(gong)(gong)(gong)作(zuo)(zuo)原(yuan)理是將(jiang)空(kong)氣(qi)以一定(ding)的風(feng)速(su)通過(guo)高(gao)效過(guo)濾器后，經(jing)阻尼(ni)層均壓，使潔(jie)凈空(kong)氣(qi)流呈(cheng)單(dan)(dan)向流送(song)向工(gong)(gong)(gong)(gong)作(zuo)(zuo)區(qu)(qu)(qu)，從(cong)而獲得工(gong)(gong)(gong)(gong)作(zuo)(zuo)保護區(qu)(qu)(qu)所需(xu)的流型和(he)潔(jie)凈度。 A級(ji)(ji)(ji)單(dan)(dan)向流罩(zhao)可(ke)以單(dan)(dan)個或(huo)多個組合使用。A級(ji)(ji)(ji)單(dan)(dan)向流罩(zhao)工(gong)(gong)(gong)(gong)作(zuo)(zuo)區(qu)(qu)(qu)為(wei)無菌核心區(qu)(qu)(qu)，操作(zuo)(zuo)人(ren)員需(xu)根據已定(ding)義的SOP從(cong)B級(ji)(ji)(ji)背(bei)景區(qu)(qu)(qu)環境打開設備，進行工(gong)(gong)(gong)(gong)藝操作(zuo)(zuo)和(he)干(gan)預，這些(xie)動作(zuo)(zuo)需(xu)根據對產品的風(feng)險大小制定(ding)。操作(zuo)(zuo)者(zhe)與無菌核心部(bu)位需(xu)避免接觸，如(ru)需(xu)接觸應通過(guo)隔(ge)離(li)手套或(huo)半身衣(yi)等。