選購好(hao)防(fang)(fang)火(huo)閥(fa)(fa)(fa)的(de)(de)注意事項：1.防(fang)(fang)火(huo)閥(fa)(fa)(fa)選用(yong)(yong)(yong)主要(yao)控制參數(shu)為規格等。2.防(fang)(fang)火(huo)閥(fa)(fa)(fa)適(shi)用(yong)(yong)(yong)于(yu)通風(feng)(feng)空調系統，除(chu)公共建筑的(de)(de)廚房排(pai)油煙系統用(yong)(yong)(yong)防(fang)(fang)火(huo)閥(fa)(fa)(fa)，動(dong)(dong)作溫度(du)(du)(du)為150℃外，一般通風(feng)(feng)空調系統用(yong)(yong)(yong)防(fang)(fang)火(huo)閥(fa)(fa)(fa)動(dong)(dong)作溫度(du)(du)(du)為70℃。3.防(fang)(fang)火(huo)閥(fa)(fa)(fa)適(shi)用(yong)(yong)(yong)于(yu)通風(feng)(feng)、空調或排(pai)煙系統的(de)(de)管道上，基(ji)本功能和適(shi)用(yong)(yong)(yong)范圍廣。4.選用(yong)(yong)(yong)閥(fa)(fa)(fa)門(men)時應(ying)注意閥(fa)(fa)(fa)門(men)的(de)(de)功能，如常開(kai)還是常閉、自動(dong)(dong)關(guan)閉開(kai)啟、手(shou)動(dong)(dong)關(guan)閉開(kai)啟、手(shou)動(dong)(dong)復位、訊(xun)號輸出、遠距離控制等要(yao)求。5.閥(fa)(fa)(fa)門(men)若(ruo)與風(feng)(feng)機聯動(dong)(dong)的(de)(de)應(ying)選用(yong)(yong)(yong)帶(dai)雙(shuang)微動(dong)(dong)開(kai)關(guan)裝置。6.閥(fa)(fa)(fa)體葉片(pian)應(ying)為鋼板(ban)，厚(hou)度(du)(du)(du)為2~6mm，閥(fa)(fa)(fa)體為不燃材料制作，轉(zhuan)動(dong)(dong)部(bu)件應(ying)采用(yong)(yong)(yong)耐腐蝕的(de)(de)金屬材料，并轉(zhuan)動(dong)(dong)靈活(huo)。閥(fa)(fa)(fa)門(men)的(de)(de)外殼厚(hou)度(du)(du)(du)不得小(xiao)于(yu)2mm。易融部(bu)件應(ying)符合(he)消防(fang)(fang)部(bu)門(men)的(de)(de)認可標(biao)準。

　正壓送(song)風(feng)口在運轉的(de)(de)時期，主要就是(shi)把(ba)外面(mian)的(de)(de)大(da)氣順利(li)的(de)(de)送(song)到室(shi)內中(zhong)(zhong)(zhong)。此類當在一樣日常生活或者場所中(zhong)(zhong)(zhong)形成了失(shi)火的(de)(de)條件下，遵照(zhao)這種(zhong)產品(pin)不(bu)止要保證樓道中(zhong)(zhong)(zhong)的(de)(de)大(da)氣流通(tong)，且(qie)一樣具備濃煙或者一氧化碳的(de)(de)狀況(kuang)中(zhong)(zhong)(zhong)，這種(zhong)產品(pin)還要遵照(zhao)大(da)氣流通(tong)來稀釋這些(xie)有(you)毒空氣，不(bu)至于使被困(kun)人士(shi)被毒氣所干擾，利(li)于人士(shi)在失(shi)火中(zhong)(zhong)(zhong)逃(tao)生。

　　正壓(ya)送(song)(song)風口適(shi)合高(gao)層(ceng)頂安(an)全(quan)送(song)(song)風或(huo)部(bu)分供冷的(de)地方，如機場(chang)大(da)廳(ting)，室內運動場(chang)，旅(lv)店廚房等地方有(you)(you)導致比(bi)大(da)，風速衰(shuai)減快的(de)優點，在(zai)(zai)空(kong)調透風操(cao)作系統中可(ke)(ke)有(you)(you)用(yong)很大(da)風量，大(da)溫高(gao)溫差送(song)(song)風以(yi)抗擊(ji)消(xiao)防正壓(ya)送(song)(song)風口概(gai)率，安(an)置安(an)裝在(zai)(zai)在(zai)(zai)天棚(peng)(peng)或(huo)屋頂棚(peng)(peng)上(shang)(shang)，可(ke)(ke)用(yong)在(zai)(zai)米之(zhi)內低狀(zhuang)況，也實用(yong)種(zhong)相當大(da)面(mian)積送(song)(song)風，相當甚至可(ke)(ke)達到(dao)米以(yi)上(shang)(shang)。