... external,durable ,lownoise,energy saving.applies for factories ,office,storage,dining room,the kitchen,basement to ventilate , exchange air and cool down. ... The Main Technical Parameters modeldia of impeller(mm)air volume(m3/min)power(w)voltage(v)current(A) ... -606001706003801.1501350FTA-757502658503801.350900 ventilation fan /solid and durable/energy saving/for exhaust air for industrial places