Patented Plant-Air circulation fan for greenhouse or henhouse. Energy saving and lower noice. Patented Plant-Air circulation fanTotally enclosed heavy-duty motor, thermally ... . Aluminum fan blade.Power-30w, Volatage-220 volts, Rpm-1400 rpm, Air Volume-840m3/h, Weight-4.6kg.Item No.Cylinder DiametermmVoltagevHzPowerwAir ...