... fan, model YDW-4.5S, air capacity: 15500 m 3/h, electric damper for exhaust airFiltering SystemPre-filter, high efficiency filter, exhaust ... Dimension: (mm)6300×3450×2700 (L×W×H)Exhaust air Capacity: (m3/h)15500Free Air Speed: (m/s)≥0.2Frequency of Air ... Exchange: (time/h )264Illumination: (Lux)≥800Efficiency of Air Filtration:≥95%Noise: dB(A ...