負壓排風扇通過(guo)(guo)負(fu)(fu)(fu)(fu)壓(ya)風(feng)(feng)(feng)(feng)扇(shan)向(xiang)外排(pai)(pai)出空(kong)氣(qi)(qi)，降(jiang)低室(shi)內氣(qi)(qi)壓(ya)，室(shi)內空(kong)氣(qi)(qi)變(bian)得稀薄，形成負(fu)(fu)(fu)(fu)壓(ya)區，空(kong)氣(qi)(qi)通過(guo)(guo)氣(qi)(qi)壓(ya)差補償流(liu)入室(shi)內。在工(gong)業(ye)廠房的實際應用中(zhong)，負(fu)(fu)(fu)(fu)壓(ya)排(pai)(pai)風(feng)(feng)(feng)(feng)扇(shan)集中(zhong)安(an)裝在廠房的一側(ce)，進(jin)(jin)氣(qi)(qi)口位于廠房的另一側(ce)，空(kong)氣(qi)(qi)從進(jin)(jin)氣(qi)(qi)口對(dui)流(liu)吹向(xiang)負(fu)(fu)(fu)(fu)壓(ya)風(feng)(feng)(feng)(feng)扇(shan)。在此(ci)過(guo)(guo)程中(zhong)，負(fu)(fu)(fu)(fu)壓(ya)風(feng)(feng)(feng)(feng)機附(fu)近的門(men)窗(chuang)保(bao)持關閉，迫使空(kong)氣(qi)(qi)通過(guo)(guo)進(jin)(jin)氣(qi)(qi)口一側(ce)的門(men)窗(chuang)流(liu)入車(che)間(jian)。空(kong)氣(qi)(qi)從進(jin)(jin)風(feng)(feng)(feng)(feng)口流(liu)入車(che)間(jian)，流(liu)經車(che)間(jian)，由負(fu)(fu)(fu)(fu)壓(ya)排(pai)(pai)風(feng)(feng)(feng)(feng)扇(shan)有序排(pai)(pai)出車(che)間(jian)。