實驗室(shi)(shi)(shi)使用(yong)的通(tong)(tong)風(feng)系(xi)統(tong)設計首(shou)先要(yao)(yao)確保實驗室(shi)(shi)(shi)的安全性，就要(yao)(yao)保證(zheng)有一(yi)(yi)定(ding)數(shu)量的換氣次(ci)(ci)數(shu);還有實驗室(shi)(shi)(shi)的通(tong)(tong)風(feng)系(xi)統(tong)負壓的設計和系(xi)統(tong)控(kong)制很重(zhong)要(yao)(yao)，要(yao)(yao)解決好(hao);系(xi)統(tong)要(yao)(yao)能穩定(ding)可靠的運(yun)行;最后就是(shi)在保證(zheng)了一(yi)(yi)定(ding)數(shu)量的換氣次(ci)(ci)數(shu)和全新風(feng)條件下，要(yao)(yao)將能耗降低(di)到最低(di)。要(yao)(yao)達到這些要(yao)(yao)求，通(tong)(tong)風(feng)設備尤其是(shi)通(tong)(tong)風(feng)柜(ju)就得有一(yi)(yi)定(ding)標準和要(yao)(yao)求。

　　首(shou)先通風(feng)柜的(de)數(shu)量(liang)由實驗(yan)室根(gen)據工藝要求和功(gong)能布(bu)置決(jue)定(ding)的(de)，有的(de)工藝要求和功(gong)能布(bu)置還會有部分局(ju)部排風(feng)罩。換氣(qi)次(ci)(ci)(ci)數(shu)通常要大于十次(ci)(ci)(ci)，在20—30次(ci)(ci)(ci)之間(jian)為好。而換氣(qi)次(ci)(ci)(ci)數(shu)的(de)多少由通風(feng)柜最大開啟(qi)面積(ji)(ji)計(ji)算的(de)通風(feng)量(liang)決(jue)定(ding)的(de)，但是如(ru)果通風(feng)柜使(shi)用的(de)人很少，應該按照通風(feng)柜最小開啟(qi)面積(ji)(ji)時(shi)的(de)通風(feng)量(liang)來計(ji)算換氣(qi)次(ci)(ci)(ci)數(shu)，如(ru)果換氣(qi)次(ci)(ci)(ci)數(shu)比所要求的(de)小，可(ke)以使(shi)用綜合排風(feng)系(xi)統(tong)，這樣可(ke)以降(jiang)低能耗(hao)。

　　其(qi)次實(shi)驗室(shi)房(fang)(fang)間要比其(qi)他(ta)輔助區域不(bu)一樣，它要求負壓，因此通(tong)風柜的(de)排(pai)氣不(bu)在室(shi)內循(xun)環，室(shi)內新風排(pai)風量(liang)只需(xu)70%-80%，剩下的(de)可以送到(dao)其(qi)他(ta)地方，例如(ru)內走廊、辦公區、實(shi)驗室(shi)輔助房(fang)(fang)間等(deng)。

　　再次通風(feng)柜(ju)的(de)要(yao)保(bao)持恒(heng)定(ding)，這可以采(cai)用(yong)定(ding)風(feng)量(liang)(liang)控(kong)制系統，即：送風(feng)量(liang)(liang)和門(men)窗縫隙補充風(feng)量(liang)(liang)恒(heng)定(ding)。

　　最后(hou)當(dang)房間里的通風(feng)(feng)(feng)量(liang)(liang)(liang)要(yao)求小而排風(feng)(feng)(feng)量(liang)(liang)(liang)要(yao)求大時(shi)(shi)，可(ke)以采(cai)用兩段式通風(feng)(feng)(feng)控(kong)制系(xi)(xi)統(tong)(tong)保(bao)(bao)證風(feng)(feng)(feng)量(liang)(liang)(liang)平衡，這種(zhong)情況也(ye)可(ke)以采(cai)用變(bian)風(feng)(feng)(feng)量(liang)(liang)(liang)控(kong)制系(xi)(xi)統(tong)(tong)，當(dang)通風(feng)(feng)(feng)柜風(feng)(feng)(feng)量(liang)(liang)(liang)變(bian)化時(shi)(shi)，排風(feng)(feng)(feng)量(liang)(liang)(liang)也(ye)會相對(dui)變(bian)小此時(shi)(shi)要(yao)求放置在屋頂的排風(feng)(feng)(feng)機(ji)隨著通風(feng)(feng)(feng)柜柜門的位置變(bian)化而變(bian)頻，降低(di)風(feng)(feng)(feng)量(liang)(liang)(liang)，保(bao)(bao)證通風(feng)(feng)(feng)柜面風(feng)(feng)(feng)速恒定。同(tong)時(shi)(shi)自控(kong)系(xi)(xi)統(tong)(tong)改(gai)變(bian)全新風(feng)(feng)(feng)風(feng)(feng)(feng)機(ji)的頻率，降低(di)風(feng)(feng)(feng)量(liang)(liang)(liang)，維持負(fu)壓平衡。變(bian)風(feng)(feng)(feng)量(liang)(liang)(liang)系(xi)(xi)統(tong)(tong)可(ke)以降低(di)系(xi)(xi)統(tong)(tong)能耗。系(xi)(xi)統(tong)(tong)最大、最小換氣次數(shu)接近(jin)則考慮采(cai)用定風(feng)(feng)(feng)量(liang)(liang)(liang)系(xi)(xi)統(tong)(tong)，使得系(xi)(xi)統(tong)(tong)簡(jian)單，降低(di)初投資。

　　通(tong)風(feng)系(xi)統(tong)(tong)不(bu)僅對實(shi)驗室(shi)通(tong)風(feng)柜有特殊要(yao)求(qiu)外(wai)，還對控(kong)制(zhi)(zhi)系(xi)統(tong)(tong)和(he)其他設備(bei)有一定的要(yao)求(qiu)和(he)標(biao)準。設備(bei)型號、通(tong)風(feng)系(xi)統(tong)(tong)設計和(he)控(kong)制(zhi)(zhi)系(xi)統(tong)(tong)都會影響到實(shi)驗室(shi)的壓(ya)力(li)(li)控(kong)制(zhi)(zhi)和(he)最(zui)小通(tong)風(feng)量的控(kong)制(zhi)(zhi)，通(tong)風(feng)系(xi)統(tong)(tong)設計和(he)控(kong)制(zhi)(zhi)系(xi)統(tong)(tong)最(zui)主要(yao)。通(tong)風(feng)系(xi)統(tong)(tong)不(bu)平衡會導致通(tong)風(feng)柜排風(feng)和(he)捕捉能力(li)(li)散失，氣流流出實(shi)驗室(shi)，建筑(zhu)物(wu)內壓(ya)力(li)(li)不(bu)穩定。

　　通(tong)(tong)風(feng)(feng)(feng)系(xi)統的(de)風(feng)(feng)(feng)量的(de)變化(hua)不能(neng)因為風(feng)(feng)(feng)管內靜(jing)壓(ya)的(de)變化(hua)影響其反(fan)應(ying)時間，從而(er)影響通(tong)(tong)風(feng)(feng)(feng)量的(de)準確性(xing)。壓(ya)力相(xiang)關(guan)型的(de)系(xi)統也會(hui)影響系(xi)統流量的(de)精確控(kong)制，使得(de)其反(fan)應(ying)時間變慢(man)，從而(er)導(dao)致送排風(feng)(feng)(feng)設備產生震蕩，速度不穩定，風(feng)(feng)(feng)量不平衡，最(zui)終(zhong)導(dao)致控(kong)制系(xi)統沒(mei)法能(neng)調節(jie)。所有系(xi)統應(ying)選擇壓(ya)力變化(hua)無關(guan)型的(de)。