... air speed(m/s)≥0.2Frequency of air Exchange(time/h)264Illumination (lux)≥800Air filter Efficiency(%)≥95%Noise(db)<80Total power ... Dimension(mm)6300*3450*2700(L*W*H)Plenum Dimension6300*3450*400(L*W*H)Basement300mm galvanized steel basement, full grilles made ... intake centrifugal fan, model YDW-4.5s, air capacity:15500m3/h,electric damper for exhaust air.Filtering systemPre-filter, high efficiency filter ...