此刻排風口選用常開型風口，每個防煙分區排風(煙)支管上設常開型防火閥(作用：起火災時控制管道內煙氣流動作用)，排煙風機入口處設常開型消防排煙防火閥。不銹鋼防火閥統(tong)的(de)(de)(de)(de)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)口也可以用常(chang)閉型的(de)(de)(de)(de)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)口，取消(xiao)(xiao)支(zhi)(zhi)管(guan)(guan)(guan)(guan)上的(de)(de)(de)(de)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)閥(fa)。某個防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)發作火(huo)(huo)(huo)(huo)災(zai)時(shi)，該防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)內(nei)的(de)(de)(de)(de)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)口主(zhu)動(dong)轉為排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)口，排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)風(feng)(feng)(feng)(feng)機(ji)(ji)主(zhu)動(dong)轉換為排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)進(jin)行排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)，共同封(feng)閉其它防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)(煙(yan)(yan)(yan)(yan)(yan))支(zhi)(zhi)管(guan)(guan)(guan)(guan)上的(de)(de)(de)(de)常(chang)開(kai)型消(xiao)(xiao)防(fang)(fang)(fang)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)閥(fa);當煙(yan)(yan)(yan)(yan)(yan)氣(qi)溫度超越(yue)(yue)280°C時(shi)主(zhu)動(dong)封(feng)閉該排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)(煙(yan)(yan)(yan)(yan)(yan))支(zhi)(zhi)管(guan)(guan)(guan)(guan)上的(de)(de)(de)(de)消(xiao)(xiao)防(fang)(fang)(fang)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)閥(fa)，一起連鎖封(feng)閉排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)中止排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)多(duo)個防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)發作火(huo)(huo)(huo)(huo)災(zai)時(shi)，這些著火(huo)(huo)(huo)(huo)防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)內(nei)的(de)(de)(de)(de)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)口主(zhu)動(dong)轉為排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)口，排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)風(feng)(feng)(feng)(feng)機(ji)(ji)主(zhu)動(dong)轉換為排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)進(jin)行排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)，一起封(feng)閉其它無火(huo)(huo)(huo)(huo)災(zai)的(de)(de)(de)(de)防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)(煙(yan)(yan)(yan)(yan)(yan))支(zhi)(zhi)管(guan)(guan)(guan)(guan)上的(de)(de)(de)(de)常(chang)開(kai)型消(xiao)(xiao)防(fang)(fang)(fang)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)閥(fa);當某個著火(huo)(huo)(huo)(huo)防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)的(de)(de)(de)(de)煙(yan)(yan)(yan)(yan)(yan)氣(qi)溫度超越(yue)(yue)280°C時(shi)主(zhu)動(dong)封(feng)閉該排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)(煙(yan)(yan)(yan)(yan)(yan))支(zhi)(zhi)管(guan)(guan)(guan)(guan)上的(de)(de)(de)(de)消(xiao)(xiao)防(fang)(fang)(fang)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)閥(fa)，其它著火(huo)(huo)(huo)(huo)防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)持續排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)，只要(yao)一切著火(huo)(huo)(huo)(huo)防(fang)(fang)(fang)煙(yan)(yan)(yan)(yan)(yan)分(fen)區(qu)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)風(feng)(feng)(feng)(feng)(煙(yan)(yan)(yan)(yan)(yan))支(zhi)(zhi)管(guan)(guan)(guan)(guan)上的(de)(de)(de)(de)消(xiao)(xiao)防(fang)(fang)(fang)排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防(fang)(fang)(fang)火(huo)(huo)(huo)(huo)閥(fa)均因(yin)煙(yan)(yan)(yan)(yan)(yan)氣(qi)溫度超越(yue)(yue)280°C而主(zhu)動(dong)封(feng)閉時(shi)，才連鎖封(feng)閉排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)中止排(pai)(pai)(pai)(pai)(pai)(pai)(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)。 

除此之外，特點：耐高溫性能良好、效率高（Draught Fan）入口處的常開型消防排煙防火閥(作用：起火災時控制管道內煙氣流動作用)因煙氣溫度超越280°C而主動封閉時，連鎖封閉排煙風機中止排煙。防火閥的作用是：當煙氣溫度達到280℃時，人已基本疏散完畢，排煙已無實際意義，而煙氣中此時已帶火，閥門自動關閉，以避免火勢蔓延。留意，因為排風體系兼排煙體系，故排風體系應按照排煙體系的要求，每個防煙分區內僅設一支排風(煙)支管，支管上設常開型消防排煙防火閥，終各支管匯總至排煙風機入口處的總管上，總管上設常開型消防排煙防火閥;當常閉型排煙口有280°C主動封閉的功用時，應將每個排煙口視為一個排煙支管，風管的安置就(jiu)可以不(bu)受約束。 

有(you)些設計師將排(pai)(pai)煙(yan)(yan)(yan)口(kou)(kou)選(xuan)用常閉型風口(kou)(kou)，與常開型排(pai)(pai)風口(kou)(kou)分隔(ge)(ge)設置，管(guan)(guan)(guan)路上(shang)也(ye)(ye)分隔(ge)(ge)安置，各(ge)路支管(guan)(guan)(guan)匯總(zong)至排(pai)(pai)煙(yan)(yan)(yan)風機(ji)（Draught Fan）入口(kou)(kou)處的總(zong)管(guan)(guan)(guan)上(shang)，排(pai)(pai)煙(yan)(yan)(yan)支管(guan)(guan)(guan)上(shang)設常開或常閉型消(xiao)防排(pai)(pai)煙(yan)(yan)(yan)防火(huo)閥(fa)(fa)(fa)(作用：起(qi)火(huo)災時控(kong)(kong)制管(guan)(guan)(guan)道(dao)內煙(yan)(yan)(yan)氣流動作用)，排(pai)(pai)風支管(guan)(guan)(guan)上(shang)設常開型排(pai)(pai)煙(yan)(yan)(yan)閥(fa)(fa)(fa)，總(zong)管(guan)(guan)(guan)上(shang)設常開型消(xiao)防排(pai)(pai)煙(yan)(yan)(yan)防火(huo)閥(fa)(fa)(fa)，這樣風口(kou)(kou)增多，管(guan)(guan)(guan)路也(ye)(ye)增多，需求操控(kong)(kong)的閥(fa)(fa)(fa)門(功能：截止、導流、穩壓、分流等)也(ye)(ye)增多，造成了(le)出資添(tian)加(jia)、運行(xing)操控(kong)(kong)體系雜亂、毛病(bing)點(dian)增多、保護辦理成本添(tian)加(jia)。3c消(xiao)防排(pai)(pai)煙(yan)(yan)(yan)風機(ji)房入口(kou)(kou)也(ye)(ye)應安裝排(pai)(pai)煙(yan)(yan)(yan)防火(huo)閥(fa)(fa)(fa)，以防火(huo)勢蔓延(yan)到風機(ji)房所在層。 

總(zong)歸，呆板(ban)的(de)(de)僅從字(zi)面(mian)上去(qu)滿足標準(zhun)所要求的(de)(de)“排(pai)煙(yan)口平常封閉”的(de)(de)規定(guī dìng)，而(er)不深究其原理，不考慮（consider)其它方(fang)面(mian)的(de)(de)做法，是有違(wei)實際排(pai)煙(yan)“安全、可行、簡單”的(de)(de)準(zhun)則的(de)(de)。