風(feng)機(ji)(ji)是(shi)依靠輸入的(de)機(ji)(ji)械能，提高氣(qi)(qi)體壓(ya)力(li)并排送(song)(song)氣(qi)(qi)體的(de)機(ji)(ji)械，它是(shi)一種從動的(de)流(liu)體機(ji)(ji)械。風(feng)機(ji)(ji)是(shi)中(zhong)國(guo)對氣(qi)(qi)體壓(ya)縮和氣(qi)(qi)體輸送(song)(song)機(ji)(ji)械的(de)習(xi)慣簡稱，通常所說的(de)風(feng)機(ji)(ji)包(bao)括通風(feng)機(ji)(ji)，鼓風(feng)機(ji)(ji)，風(feng)力(li)發電機(ji)(ji)。
風(feng)機廣泛(fan)用于工廠、礦井、隧道、冷卻塔(ta)、車輛、船(chuan)舶(bo)和建筑物(wu)的(de)通風(feng)、排塵和冷卻，鍋(guo)爐和工業爐窯(yao)的(de)通風(feng)和引風(feng)；空氣(qi)調節設備和家用電(dian)器設備中的(de)冷卻和通風(feng)；谷(gu)物(wu)的(de)烘干和選送(song)，風(feng)洞(dong)風(feng)源和氣(qi)墊船(chuan)的(de)充氣(qi)和推(tui)進(jin)等

風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)，是(shi)用(yong)(yong)于空氣輸送和(he)(he)分布的管(guan)(guan)(guan)道系統。有復(fu)合(he)(he)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)和(he)(he)無機風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)兩種。復(fu)合(he)(he)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)以(yi)Durkduct風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)為(wei)(wei)代表(biao)。可按截(jie)面(mian)形(xing)(xing)狀和(he)(he)材(cai)質分類。風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)制(zhi)作(zuo)不銹鋼風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)制(zhi)作(zuo)是(shi)在咬口(kou)縫、鉚釘縫、法蘭翻邊四(si)角等(deng)縫隙(xi)處涂上密封膠(jiao)（如中(zhong)性玻璃膠(jiao)）。涂密封膠(jiao)前應清(qing)除表(biao)面(mian)塵土和(he)(he)油污。按截(jie)面(mian)形(xing)(xing)狀，風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)可分為(wei)(wei)圓(yuan)形(xing)(xing)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)，矩(ju)形(xing)(xing)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)，扁圓(yuan)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)等(deng)多種，其中(zhong)圓(yuan)形(xing)(xing)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)阻力(li)小(xiao)但高度尺寸(cun)大，制(zhi)作(zuo)復(fu)雜。所以(yi)應用(yong)(yong)以(yi)矩(ju)形(xing)(xing)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)為(wei)(wei)主。按材(cai)質，風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)可分為(wei)(wei)金(jin)屬(shu)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)，復(fu)合(he)(he)風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)，高分子風(feng)(feng)(feng)(feng)管(guan)(guan)(guan)。