止逆閥(fa)式：止逆閥(fa)式煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)則是(shi)在單(dan)管煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)上的(de)(de)各層進(jin)風(feng)口(kou)處，加裝一個(ge)兼(jian)有(you)抽(chou)油煙(yan)(yan)(yan)(yan)機接口(kou)作(zuo)用(yong)的(de)(de)復(fu)雜(za)防氣(qi)(qi)流逆行(xing)的(de)(de)止逆閥(fa)，迫使(shi)煙(yan)(yan)(yan)(yan)氣(qi)(qi)向(xiang)煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)單(dan)向(xiang)運動，從而(er)解決煙(yan)(yan)(yan)(yan)氣(qi)(qi)互串的(de)(de)問題(ti)，但(dan)此種做法會(hui)(hui)輕度影(ying)響油煙(yan)(yan)(yan)(yan)機的(de)(de)排(pai)煙(yan)(yan)(yan)(yan)效果。　每家的(de)(de)廚房(fang)里(li)都有(you)煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)，同時煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)也有(you)主(zhu)(zhu)副之分，主(zhu)(zhu)煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)貫(guan)穿整個(ge)樓體，而(er)副煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)是(shi)相對獨立的(de)(de)。一般家里(li)的(de)(de)油煙(yan)(yan)(yan)(yan)會(hui)(hui)先到副煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)里(li)，然后再通過隔(ge)板上的(de)(de)孔進(jin)入主(zhu)(zhu)煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)，這(zhe)樣可(ke)保證(zheng)每戶的(de)(de)油煙(yan)(yan)(yan)(yan)是(shi)隔(ge)離開來的(de)(de)。而(er)如果將副煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)直接連接主(zhu)(zhu)煙(yan)(yan)(yan)(yan)道(dao)(dao)(dao)，就會(hui)(hui)由于(yu)壓力過低(di)而(er)導致倒(dao)煙(yan)(yan)(yan)(yan)或串煙(yan)(yan)(yan)(yan)現象。

按截面形狀，不銹(xiu)鋼圓(yuan)彎(wan)頭安(an)裝，風(feng)(feng)(feng)(feng)管(guan)可分(fen)為(wei)圓(yuan)形風(feng)(feng)(feng)(feng)管(guan)，矩形風(feng)(feng)(feng)(feng)管(guan)，扁圓(yuan)風(feng)(feng)(feng)(feng)管(guan)等多種(zhong)。其中圓(yuan)形風(feng)(feng)(feng)(feng)管(guan)阻(zu)(zu)力但(dan)高度(du)尺寸，制作(zuo)(zuo)復雜。所以應(ying)用(yong)以矩形風(feng)(feng)(feng)(feng)管(guan)為(wei)主。按材(cai)質，風(feng)(feng)(feng)(feng)管(guan)可分(fen)為(wei)金(jin)(jin)屬(shu)風(feng)(feng)(feng)(feng)管(guan)，復合(he)風(feng)(feng)(feng)(feng)管(guan)，高分(fen)子(zi)風(feng)(feng)(feng)(feng)管(guan)。其中金(jin)(jin)屬(shu)風(feng)(feng)(feng)(feng)管(guan)就是用(yong)各(ge)種(zhong)金(jin)(jin)屬(shu)材(cai)料制作(zuo)(zuo)的(de)(de)風(feng)(feng)(feng)(feng)管(guan)，常用(yong)的(de)(de)包括鍍鋅(xin)鐵皮和不銹(xiu)鋼等。隨著(zhu)技術的(de)(de)發(fa)展，復合(he)風(feng)(feng)(feng)(feng)管(guan)開始選用(yong)無機(ji)(ji)材(cai)料制作(zuo)(zuo)，于是就有了無機(ji)(ji)風(feng)(feng)(feng)(feng)管(guan)。無機(ji)(ji)風(feng)(feng)(feng)(feng)管(guan)的(de)(de)材(cai)質輕而多孔(kong)，熱阻(zu)(zu)也大，能夠(gou)更好的(de)(de)保證送風(feng)(feng)(feng)(feng)過程中，贛榆圓(yuan)彎(wan)頭安(an)裝，冷熱風(feng)(feng)(feng)(feng)的(de)(de)溫度(du)不流失(shi)。

廚房(fang)排煙(yan)(yan)管道(dao)的(de)水平段不宜太長，白鐵皮圓彎(wan)頭(tou)(tou)安(an)裝，一(yi)般水平遠距離不應超過(guo)15m并且要(yao)有2%以(yi)(yi)(yi)上的(de)坡度(du)(du)，水平末(mo)端(duan)設活接(jie)頭(tou)(tou)，以(yi)(yi)(yi)方便清理油(you)垢。排風(feng)(feng)速度(du)(du)按(an)規范不得低于(yu) 10m/s，以(yi)(yi)(yi)防風(feng)(feng)速過(guo)低使油(you)附著于(yu)煙(yan)(yan)道(dao)上，通風(feng)(feng)管道(dao)圓彎(wan)頭(tou)(tou)安(an)裝，接(jie)排風(feng)(feng)罩(zhao)的(de)支管應設風(feng)(feng)量調節閥(fa)。送風(feng)(feng)系(xi)(xi)統(tong)應為直流方式，廚房(fang)的(de)通風(feng)(feng)系(xi)(xi)統(tong)宜采用變速風(feng)(feng)機(ji)或關聯又風(feng)(feng)機(ji)進行送排風(feng)(feng)。如果已經(jing)把(ba)副(fu)煙(yan)(yan)道(dao)拆除，或是需要(yao)防止(zhi)(zhi)(zhi)倒煙(yan)(yan)的(de)效果更(geng)好(hao)，建議可(ke)以(yi)(yi)(yi)煙(yan)(yan)道(dao)上安(an)裝止(zhi)(zhi)(zhi)逆(ni)閥(fa)，使煙(yan)(yan)道(dao)里(li)的(de)煙(yan)(yan)不會向(xiang)管道(dao)和抽(chou)油(you)煙(yan)(yan)機(ji)內倒灌。安(an)裝止(zhi)(zhi)(zhi)逆(ni)閥(fa)后要(yao)定(ding)期清洗，否則會使止(zhi)(zhi)(zhi)逆(ni)閥(fa)呈打開(kai)狀態，失去效果，而煙(yan)(yan)道(dao)止(zhi)(zhi)(zhi)逆(ni)閥(fa)兩年左右更(geng)換一(yi)次。