風(feng)(feng)機(ji)(ji)風(feng)(feng)量的(de)定義(yi)為(wei):風(feng)(feng)速V與風(feng)(feng)道截面積F的(de)乘積.大型風(feng)(feng)機(ji)(ji)由于(yu)能夠用風(feng)(feng)速計(ji)準確測出(chu)風(feng)(feng)速,所以風(feng)(feng)量計(ji)算(suan)(suan)也很簡單,直接用公(gong)式(shi)Q=VF,便可算(suan)(suan)出(chu)風(feng)(feng)量.

風(feng)(feng)(feng)(feng)(feng)(feng)機數量(liang)的確定 根據(ju)所(suo)選房(fang)間(jian)的換氣次(ci)數,計(ji)算(suan)(suan)廠(chang)(chang)房(fang)所(suo)需總風(feng)(feng)(feng)(feng)(feng)(feng)量(liang),進(jin)而計(ji)算(suan)(suan)得(de)風(feng)(feng)(feng)(feng)(feng)(feng)機數量(liang).計(ji)算(suan)(suan)公(gong)式(shi)：N=V×n/Q 其中(zhong)：N——風(feng)(feng)(feng)(feng)(feng)(feng)機數量(liang)（臺）； V——場地體積（m3）； n——換氣次(ci)數（次(ci)/時）； Q——所(suo)選風(feng)(feng)(feng)(feng)(feng)(feng)機型號(hao)(hao)的單(dan)臺風(feng)(feng)(feng)(feng)(feng)(feng)量(liang)（m3/h）.風(feng)(feng)(feng)(feng)(feng)(feng)機型號(hao)(hao)的選擇(ze)應該根據(ju)廠(chang)(chang)房(fang)實(shi)(shi)際情況,盡量(liang)選取(qu)與原窗(chuang)口尺寸相匹配的風(feng)(feng)(feng)(feng)(feng)(feng)機型號(hao)(hao),風(feng)(feng)(feng)(feng)(feng)(feng)機與濕簾(lian)盡量(liang)保持一定的距離（盡可能分別裝在(zai)廠(chang)(chang)房(fang)的山墻兩側）,實(shi)(shi)現良(liang)好的通風(feng)(feng)(feng)(feng)(feng)(feng)換氣效果.排風(feng)(feng)(feng)(feng)(feng)(feng)側盡量(liang)不靠近(jin)附(fu)近(jin)建(jian)筑物,以防影(ying)響附(fu)近(jin)住戶.如從室內帶出的空氣中(zhong)含有污(wu)染環(huan)境,可以在(zai)風(feng)(feng)(feng)(feng)(feng)(feng)口安裝噴(pen)水裝置,吸附(fu)近(jin)污(wu)染物集中(zhong)回收,不污(wu)染環(huan)境