如果(guo)已經把(ba)副煙(yan)(yan)(yan)(yan)道拆除，或是需要防止(zhi)(zhi)倒煙(yan)(yan)(yan)(yan)的效果(guo)更好(hao)(hao)，那么(me)使用煙(yan)(yan)(yan)(yan)道止(zhi)(zhi)逆閥(fa)(fa)。一(yi)般(ban)情況下(xia)，油煙(yan)(yan)(yan)(yan)機的止(zhi)(zhi)逆閥(fa)(fa)效果(guo)不是很明顯(xian)，而在(zai)煙(yan)(yan)(yan)(yan)道安(an)裝(zhuang)止(zhi)(zhi)逆閥(fa)(fa)可以(yi)(yi)保護油煙(yan)(yan)(yan)(yan)機，使煙(yan)(yan)(yan)(yan)道里的煙(yan)(yan)(yan)(yan)不會(hui)向管道和抽油煙(yan)(yan)(yan)(yan)機內倒灌(guan)。不過，安(an)裝(zhuang)止(zhi)(zhi)逆閥(fa)(fa)后要定(ding)期(qi)清洗，否則會(hui)使止(zhi)(zhi)逆閥(fa)(fa)呈(cheng)打開狀(zhuang)態，不銹鋼廚房(fang)排(pai)煙(yan)(yan)(yan)(yan)管道制(zhi)作(zuo)(zuo)，失去效果(guo)，鍍(du)鋅板廚房(fang)排(pai)煙(yan)(yan)(yan)(yan)管道制(zhi)作(zuo)(zuo)，而且煙(yan)(yan)(yan)(yan)道止(zhi)(zhi)逆閥(fa)(fa)好(hao)(hao)兩年(nian)左右(you)就更換(huan)一(yi)次。隨著社會(hui)的發(fa)展，很多家(jia)(jia)庭住宅的廚房(fang)都以(yi)(yi)自家(jia)(jia)的窗向外排(pai)放油煙(yan)(yan)(yan)(yan)，從(cong)而導(dao)致樓(lou)下(xia)炒菜，樓(lou)上冒煙(yan)(yan)(yan)(yan)。所以(yi)(yi)家(jia)(jia)庭裝(zhuang)修(xiu)時，廚房(fang)煙(yan)(yan)(yan)(yan)道裝(zhuang)修(xiu)顯(xian)得(de)非常重要，一(yi)旦出現不合理，就會(hui)造成反味(wei)現象，泗洪廚房(fang)排(pai)煙(yan)(yan)(yan)(yan)管道制(zhi)作(zuo)(zuo)，對家(jia)(jia)居生活造成影響。

1、主排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)通(tong)(tong)(tong)風(feng)面(mian)積(ji)不(bu)(bu)夠(gou)，氣體(ti)流速(su)(su)過(guo)(guo)大(da)。根據工程經驗，排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)主管(guan)(guan)道(dao)(dao)(dao)內風(feng)速(su)(su)不(bu)(bu)能超過(guo)(guo)15m/s。否則在(zai)(zai)運(yun)行一(yi)(yi)個時期以后(如(ru)一(yi)(yi)年以后)很(hen)容易造成(cheng)排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)系統不(bu)(bu)通(tong)(tong)(tong)暢。在(zai)(zai)油(you)煙(yan)(yan)(yan)(yan)(yan)(yan)凈化器的(de)(de)(de)運(yun)行實(shi)踐中(zhong)，大(da)部分案(an)例都是因排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)通(tong)(tong)(tong)風(feng)面(mian)積(ji)不(bu)(bu)足引起的(de)(de)(de)不(bu)(bu)通(tong)(tong)(tong)暢，管(guan)(guan)道(dao)(dao)(dao)內氣體(ti)的(de)(de)(de)流速(su)(su)都在(zai)(zai)15m/s以上(shang)。2、排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)由于(yu)要穿過(guo)(guo)建筑梁而使管(guan)(guan)道(dao)(dao)(dao)通(tong)(tong)(tong)風(feng)截面(mian)積(ji)變小，截面(mian)上(shang)阻力增加，不(bu)(bu)銹鋼廚(chu)房(fang)排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)制作，造成(cheng)氣流不(bu)(bu)通(tong)(tong)(tong)暢。3、排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)在(zai)(zai)穿過(guo)(guo)建筑梁或(huo)躲避其它設備管(guan)(guan)道(dao)(dao)(dao)時，排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)中(zhong)的(de)(de)(de)一(yi)(yi)段(duan)會(hui)低于(yu)整(zheng)體(ti)排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)平面(mian)。在(zai)(zai)使用一(yi)(yi)段(duan)時間后，由于(yu)油(you)水混合物會(hui)積(ji)聚在(zai)(zai)較低的(de)(de)(de)那段(duan)排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)管(guan)(guan)道(dao)(dao)(dao)中(zhong)，直接影響排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)通(tong)(tong)(tong)暢。4、不(bu)(bu)同樓(lou)層的(de)(de)(de)廚(chu)房(fang)油(you)煙(yan)(yan)(yan)(yan)(yan)(yan)通(tong)(tong)(tong)過(guo)(guo)同一(yi)(yi)主管(guan)(guan)道(dao)(dao)(dao)排(pai)(pai)(pai)出，離出口(kou)近的(de)(de)(de)樓(lou)層廚(chu)房(fang)排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)效果(guo)較好，而較低樓(lou)層的(de)(de)(de)廚(chu)房(fang)排(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)不(bu)(bu)通(tong)(tong)(tong)暢。

盡管(guan)(guan)這種側吸(xi)煙(yan)機油(you)煙(yan)分離達(da)到(dao)90％，但還是(shi)有10％被排出去(qu)的，所以煙(yan)管(guan)(guan)上必(bi)然要掛一(yi)(yi)些油(you)煙(yan)，我想(xiang)如果(guo)煙(yan)機是(shi)緊貼(tie)著墻排出去(qu)，那(nei)直(zhi)接裝(zhuang)硬管(guan)(guan)應(ying)該是(shi)沒什(shen)么問題，因為(wei)煙(yan)道短，大部分油(you)煙(yan)能(neng)很(hen)出去(qu)，但如果(guo)煙(yan)道比較長，可能(neng)油(you)煙(yan)就會(hui)在(zai)煙(yan)管(guan)(guan)上有遺留，那(nei)接一(yi)(yi)段(duan)軟(ruan)管(guan)(guan)也(ye)(ye)便于檢修或更換(huan)(huan)，但軟(ruan)管(guan)(guan)好是(shi)接在(zai)柜子(zi)底(di)(di)下(xia)那(nei)一(yi)(yi)段(duan)（9），也(ye)(ye)就是(shi)裝(zhuang)硬管(guan)(guan)一(yi)(yi)直(zhi)裝(zhuang)到(dao)吊頂底(di)(di)下(xia)，就在(zai)柜子(zi)里面那(nei)一(yi)(yi)小段(duan)用軟(ruan)管(guan)(guan)，這樣用五六(liu)年以后(hou)，軟(ruan)管(guan)(guan)上如果(guo)掛上油(you)了，把它拆下(xia)來換(huan)(huan)一(yi)(yi)下(xia)就行了，而(er)且(qie)底(di)(di)下(xia)止逆(ni)閥也(ye)(ye)能(neng)拆下(xia)來清(qing)洗(xi)一(yi)(yi)下(xia)。