實(shi)(shi)驗(yan)室(shi)通風(feng)(feng)要(yao)求新風(feng)(feng)全(quan)部(bu)來(lai)自室(shi)外(wai)(wai)，然后100%排(pai)出(chu)室(shi)外(wai)(wai)，通風(feng)(feng)柜的排(pai)氣不在室(shi)內(nei)(nei)循環。化學實(shi)(shi)驗(yan)室(shi)換(huan)氣要(yao)求每小時大(da)于(yu)10次，物理實(shi)(shi)驗(yan)室(shi)每小時大(da)于(yu)10次，實(shi)(shi)驗(yan)室(shi)無人(ren)時換(huan)氣可減(jian)少為6次。實(shi)(shi)驗(yan)室(shi)通風(feng)(feng)柜設計數量要(yao)足夠，并(bing)且不作為唯一的室(shi)內(nei)(nei)排(pai)風(feng)(feng)裝置，儀(yi)器(qi)室(shi)或(huo)產生危險物質的儀(yi)器(qi)上(shang)方設局部(bu)排(pai)風(feng)(feng)系統。

　　實(shi)(shi)(shi)驗室(shi)(shi)(shi)的(de)(de)(de)(de)補(bu)風(feng)(feng)(feng)(feng)一(yi)部分來(lai)(lai)自空(kong)調系(xi)統(tong)直接送(song)(song)入(ru)實(shi)(shi)(shi)驗室(shi)(shi)(shi)的(de)(de)(de)(de)新(xin)風(feng)(feng)(feng)(feng)，這(zhe)部分新(xin)風(feng)(feng)(feng)(feng)根據實(shi)(shi)(shi)驗室(shi)(shi)(shi)排風(feng)(feng)(feng)(feng)量的(de)(de)(de)(de)變(bian)化而變(bian)化;另一(yi)部分通(tong)過空(kong)調系(xi)統(tong)送(song)(song)入(ru)非實(shi)(shi)(shi)驗室(shi)(shi)(shi)區(qu)域(yu)的(de)(de)(de)(de)走道(dao)、房間(jian)再通(tong)過實(shi)(shi)(shi)驗室(shi)(shi)(shi)的(de)(de)(de)(de)門縫補(bu)給。實(shi)(shi)(shi)驗室(shi)(shi)(shi)的(de)(de)(de)(de)負(fu)壓通(tong)過送(song)(song)排風(feng)(feng)(feng)(feng)風(feng)(feng)(feng)(feng)量和送(song)(song)排風(feng)(feng)(feng)(feng)口的(de)(de)(de)(de)布置(zhi)來(lai)(lai)實(shi)(shi)(shi)現，氣流組織從辦公、管理用房、內走道(dao)、到產生危(wei)險物質的(de)(de)(de)(de)實(shi)(shi)(shi)驗房間(jian)。通(tong)風(feng)(feng)(feng)(feng)柜的(de)(de)(de)(de)位置(zhi)布置(zhi)在遠(yuan)離空(kong)氣流動紊流大的(de)(de)(de)(de)地(di)方，遠(yuan)離行走區(qu)域(yu)和空(kong)氣新(xin)風(feng)(feng)(feng)(feng)區(qu)。新(xin)風(feng)(feng)(feng)(feng)從遠(yuan)離通(tong)風(feng)(feng)(feng)(feng)柜的(de)(de)(de)(de)地(di)方引入(ru)，空(kong)氣流動路徑遠(yuan)離通(tong)風(feng)(feng)(feng)(feng)柜。

　　通(tong)風系(xi)統設(she)計要(yao)根據建(jian)筑功(gong)能、平面分布及甲方的(de)使用(yong)要(yao)求(qiu)，綜合技(ji)術、經濟、管理等因(yin)素，還應當(dang)考慮工藝流程(cheng)、使用(yong)情況(kuang)及有害氣(qi)體性質等因(yin)素。