主(zhu)次式(shi)：主(zhu)次式(shi)煙(yan)(yan)(yan)道(dao)截面(mian)上由兩個并列矩(ju)形(xing)煙(yan)(yan)(yan)管構成(cheng)，垂直(zhi)穿越各樓層(ceng)(ceng)。次煙(yan)(yan)(yan)道(dao)在住宅每層(ceng)(ceng)中(zhong)設一連(lian)接排(pai)油(you)(you)煙(yan)(yan)(yan)機的(de)(de)進風(feng)口，次煙(yan)(yan)(yan)道(dao)與(yu)主(zhu)煙(yan)(yan)(yan)道(dao)距(ju)進風(feng)口一定距(ju)離處(chu)相匯，主(zhu)煙(yan)(yan)(yan)道(dao)底層(ceng)(ceng)有(you)一補風(feng)口。其(qi)原理是通過抽油(you)(you)煙(yan)(yan)(yan)機將(jiang)煙(yan)(yan)(yan)氣(qi)推入(ru)次煙(yan)(yan)(yan)道(dao)中(zhong)，用(yong)抽油(you)(you)煙(yan)(yan)(yan)機推動力(li)和油(you)(you)煙(yan)(yan)(yan)溫(wen)度上浮力(li)使油(you)(you)煙(yan)(yan)(yan)上升一段距(ju)離后再進入(ru)主(zhu)煙(yan)(yan)(yan)道(dao)排(pai)出(chu)屋面(mian)。　變(bian)壓式(shi)：將(jiang)各層(ceng)(ceng)的(de)(de)煙(yan)(yan)(yan)道(dao)做成(cheng)不同(tong)的(de)(de)截面(mian)形(xing)式(shi)，下層(ceng)(ceng)煙(yan)(yan)(yan)道(dao)通過主(zhu)次煙(yan)(yan)(yan)道(dao)排(pai)氣(qi)，而靠近屋面(mian)的(de)(de)煙(yan)(yan)(yan)道(dao)如同(tong)單煙(yan)(yan)(yan)道(dao)的(de)(de)作用(yong)，直(zhi)接將(jiang)油(you)(you)煙(yan)(yan)(yan)排(pai)入(ru)煙(yan)(yan)(yan)道(dao)排(pai)出(chu)。其(qi)目(mu)的(de)(de)是試圖通過改(gai)變(bian)煙(yan)(yan)(yan)道(dao)的(de)(de)截面(mian)形(xing)式(shi)，利用(yong)煙(yan)(yan)(yan)氣(qi)流動的(de)(de)各種物理規律，使氣(qi)流保持向上的(de)(de)運動，防止煙(yan)(yan)(yan)氣(qi)倒灌和互串。

常(chang)見的(de)排(pai)風(feng)(feng)扇有3種：軸(zhou)流風(feng)(feng)扇，風(feng)(feng)箱和(he)離(li)心(xin)風(feng)(feng)扇。（1）以前使(shi)用軸(zhou)流風(feng)(feng)機(ji)，但(dan)由于總壓小，因此(ci)在安裝(zhuang)(zhuang)油煙(yan)凈化器后很少使(shi)用。 （2）氣柜全壓適(shi)中(zhong)(zhong)，噪音低，風(feng)(feng)量可調(diao)(diao)。它通常(chang)用在溫室排(pai)氣系(xi)統的(de)廚房(fang)排(pai)氣系(xi)統中(zhong)(zhong)，通風(feng)(feng)櫥和(he)排(pai)氣口之間的(de)距離(li)中(zhong)(zhong)等。（3）可以調(diao)(diao)節離(li)心(xin)風(feng)(feng)機(ji)的(de)全壓和(he)風(feng)(feng)量，但(dan)是(shi)由于噪音大(da)，使(shi)用量不大(da)。隨(sui)著(zhu)社會的(de)發展，很多(duo)家(jia)(jia)(jia)庭(ting)(ting)住宅的(de)廚房(fang)都以自家(jia)(jia)(jia)的(de)窗向外(wai)排(pai)放油煙(yan)，不銹鋼激光切(qie)割鐵板折(zhe)件制作，從而導(dao)致(zhi)樓下炒菜，樓上(shang)冒(mao)煙(yan)。所以家(jia)(jia)(jia)庭(ting)(ting)裝(zhuang)(zhuang)修時，廚房(fang)煙(yan)道裝(zhuang)(zhuang)修顯得非常(chang)重(zhong)要，一旦出(chu)現(xian)不合理(li)，就(jiu)會造(zao)成(cheng)反味現(xian)象，對(dui)家(jia)(jia)(jia)居生活造(zao)成(cheng)影響(xiang)。

　《民用(yong)建筑設計通則(ze)》規(gui)(gui)定(ding)，煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)伸出屋面(mian)高度不(bu)低(di)于0.6米。但有(you)(you)些地方對(dui)此規(gui)(gui)定(ding)的(de)(de)(de)執行情況不(bu)一(yi)。一(yi)些建了煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)的(de)(de)(de)住(zhu)宅(zhai)設計的(de)(de)(de)煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)類型單(dan)(dan)一(yi)，容易(yi)造成油(you)煙(yan)(yan)(yan)(yan)(yan)倒(dao)灌、串味。另外(wai)，一(yi)些樓盤(pan)為了增(zeng)大廚房面(mian)積，縮小了豎向煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)的(de)(de)(de)橫截面(mian)積，并(bing)且(qie)沒(mei)有(you)(you)機械(xie)排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)裝置，以至排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)系統(tong)流量很(hen)小，造成排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)不(bu)暢。當前的(de)(de)(de)住(zhu)宅(zhai)煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)一(yi)般(ban)分(fen)為：單(dan)(dan)煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)式(shi)、主次式(shi)、變壓式(shi)、止逆閥式(shi)。　　單(dan)(dan)煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)式(shi)：由一(yi)個簡(jian)單(dan)(dan)的(de)(de)(de)矩形煙(yan)(yan)(yan)(yan)(yan)管構(gou)成，垂直穿越各層(ceng)(ceng)(ceng)住(zhu)宅(zhai)，在每(mei)層(ceng)(ceng)(ceng)住(zhu)宅(zhai)中留有(you)(you)一(yi)個連接(jie)抽油(you)煙(yan)(yan)(yan)(yan)(yan)機的(de)(de)(de)進(jin)風(feng)(feng)口，底層(ceng)(ceng)(ceng)由一(yi)個補風(feng)(feng)口。其(qi)原理是各層(ceng)(ceng)(ceng)煙(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)在抽油(you)煙(yan)(yan)(yan)(yan)(yan)機的(de)(de)(de)推動下，將(jiang)油(you)煙(yan)(yan)(yan)(yan)(yan)排(pai)(pai)入煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)中，由于煙(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)溫度的(de)(de)(de)作(zuo)用(yong)，在煙(yan)(yan)(yan)(yan)(yan)道(dao)(dao)中產生(sheng)上升浮(fu)力，從出屋面(mian)的(de)(de)(de)出風(feng)(feng)口將(jiang)煙(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)排(pai)(pai)出。