(1)實驗室根據工藝要(yao)求和(he)(he)功能布置選擇(ze)一定數(shu)量的(de)(de)通(tong)風(feng)(feng)(feng)柜，有的(de)(de)還兼有部分局部排(pai)(pai)風(feng)(feng)(feng)罩。通(tong)常校核(he)下來換(huan)氣(qi)次(ci)數(shu)遠遠大于(yu)10次(ci)，一般在(zai)20-30次(ci)以(yi)上，滿足(zu)換(huan)氣(qi)次(ci)數(shu)要(yao)求。但是此換(huan)氣(qi)次(ci)數(shu)是按照(zhao)通(tong)風(feng)(feng)(feng)柜開(kai)啟面積計算的(de)(de)通(tong)風(feng)(feng)(feng)量，資料和(he)(he)經驗表明100臺通(tong)風(feng)(feng)(feng)柜99%的(de)(de)時間(jian)只有18個或更(geng)少(shao)的(de)(de)人在(zai)使用。故還應校核(he)通(tong)風(feng)(feng)(feng)柜開(kai)啟面積時的(de)(de)通(tong)風(feng)(feng)(feng)量和(he)(he)換(huan)氣(qi)次(ci)數(shu)，若小于(yu)換(huan)氣(qi)次(ci)數(shu)要(yao)求，則增加綜合(he)排(pai)(pai)風(feng)(feng)(feng)系(xi)統。

(2)實驗室通風系統設計采用全(quan)新(xin)風系統，通風柜的(de)排(pai)(pai)氣不在(zai)室內(nei)循環。由(you)于實驗室要求房(fang)(fang)間相(xiang)對其他輔助區域為負壓。所以實驗室的(de)新(xin)風量設計為排(pai)(pai)風量的(de)70﹪-80﹪。另外(wai)20﹪-30﹪的(de)新(xin)風送至實驗室輔助房(fang)(fang)間、辦(ban)公、管(guan)理用房(fang)(fang)、內(nei)走道等(deng)，再由(you)門(men)窗縫隙補充到房(fang)(fang)間。

(3)通(tong)風(feng)柜的風(feng)量(liang)(liang)平衡可以采用定風(feng)量(liang)(liang)控制系統，即排風(feng)量(liang)(liang)恒(heng)定，送風(feng)量(liang)(liang)和門(men)窗縫隙補充風(feng)量(liang)(liang)恒(heng)定。實(shi)驗室家具此方法(fa)適用于排風(feng)量(liang)(liang)滿(man)足換氣次數要求的實(shi)驗室。

(4)對于排風(feng)(feng)(feng)(feng)(feng)量(liang)遠大于通(tong)(tong)(tong)風(feng)(feng)(feng)(feng)(feng)量(liang)要(yao)求(qiu)(qiu)的(de)(de)房間還可以(yi)采(cai)用(yong)(yong)(yong)兩(liang)段式通(tong)(tong)(tong)風(feng)(feng)(feng)(feng)(feng)控制系(xi)(xi)(xi)統(tong)(tong)(tong)保(bao)證風(feng)(feng)(feng)(feng)(feng)量(liang)平衡(heng)，即根(gen)據(ju)通(tong)(tong)(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)的(de)(de)位移信號，排風(feng)(feng)(feng)(feng)(feng)機(ji)(ji)、送風(feng)(feng)(feng)(feng)(feng)機(ji)(ji)有2種送風(feng)(feng)(feng)(feng)(feng)工況，低風(feng)(feng)(feng)(feng)(feng)量(liang)工況應用(yong)(yong)(yong)于維(wei)持換(huan)氣(qi)次(ci)數(shu)的(de)(de)要(yao)求(qiu)(qiu)，節約能耗。此情(qing)形藥檢所采(cai)用(yong)(yong)(yong)了變(bian)風(feng)(feng)(feng)(feng)(feng)量(liang)控制系(xi)(xi)(xi)統(tong)(tong)(tong)。通(tong)(tong)(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)風(feng)(feng)(feng)(feng)(feng)量(liang)變(bian)化時(shi)，排風(feng)(feng)(feng)(feng)(feng)量(liang)也會(hui)相對變(bian)小，此時(shi)要(yao)求(qiu)(qiu)放置在屋頂的(de)(de)排風(feng)(feng)(feng)(feng)(feng)機(ji)(ji)隨著通(tong)(tong)(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)柜(ju)門的(de)(de)位置變(bian)化而(er)變(bian)頻，降(jiang)低風(feng)(feng)(feng)(feng)(feng)量(liang)，保(bao)證通(tong)(tong)(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)面風(feng)(feng)(feng)(feng)(feng)速恒(heng)定。同時(shi)自(zi)控系(xi)(xi)(xi)統(tong)(tong)(tong)改變(bian)全新風(feng)(feng)(feng)(feng)(feng)風(feng)(feng)(feng)(feng)(feng)機(ji)(ji)的(de)(de)頻率，降(jiang)低風(feng)(feng)(feng)(feng)(feng)量(liang)，維(wei)持負壓(ya)平衡(heng)。變(bian)風(feng)(feng)(feng)(feng)(feng)量(liang)系(xi)(xi)(xi)統(tong)(tong)(tong)可以(yi)降(jiang)低系(xi)(xi)(xi)統(tong)(tong)(tong)能耗。系(xi)(xi)(xi)統(tong)(tong)(tong)、換(huan)氣(qi)次(ci)數(shu)接(jie)近則(ze)考慮采(cai)用(yong)(yong)(yong)定風(feng)(feng)(feng)(feng)(feng)量(liang)系(xi)(xi)(xi)統(tong)(tong)(tong)，使得系(xi)(xi)(xi)統(tong)(tong)(tong)簡單，降(jiang)低初投資。