實(shi)驗室通(tong)(tong)風(feng)(feng)(feng)(feng)系(xi)統(tong)，其中，主(zhu)要的(de)是(shi)實(shi)驗內(nei)容和有(you)害(hai)物的(de)性質。通(tong)(tong)常規定(ding)，一般無毒的(de)污染物為(wei)(wei)(wei)0.25―0.38m/s，有(you)毒或有(you)危(wei)險的(de)有(you)害(hai)物為(wei)(wei)(wei)0.4―0.5 m/s ，劇毒或有(you)少(shao)量(liang)放(fang)射性為(wei)(wei)(wei)0.5―0.6m/s，氣(qi)狀物為(wei)(wei)(wei)0.5m/s，粒狀物為(wei)(wei)(wei)1m/s。為(wei)(wei)(wei)了確保這樣的(de)風(feng)(feng)(feng)(feng)速，排(pai)風(feng)(feng)(feng)(feng)機(ji)應有(you)必要的(de)靜(jing)壓，即空(kong)氣(qi)通(tong)(tong)過(guo)(guo)通(tong)(tong)風(feng)(feng)(feng)(feng)管(guan)道(dao)時的(de)摩擦阻力。另外，確定(ding)風(feng)(feng)(feng)(feng)速時還須***注意噪(zao)音問題。通(tong)(tong)過(guo)(guo)空(kong)氣(qi)在管(guan)道(dao)內(nei)流動時以7―10m為(wei)(wei)(wei)限，超過(guo)(guo)10m將產生噪(zao)音，通(tong)(tong)常實(shi)驗室的(de)(室內(nei)背景噪(zao)聲(sheng)級)噪(zao)聲(sheng)限制(zhi)值為(wei)(wei)(wei)70dBA。增加管(guan)道(dao)裁面積會降低(di)風(feng)(feng)(feng)(feng)速，也就降低(di)了噪(zao)音。考慮到管(guan)道(dao)的(de)經費和施工問題，須***慎重選(xuan)擇管(guan)道(dao)及排(pai)風(feng)(feng)(feng)(feng)機(ji)的(de)功率。
