e precision forging forming, dynamic balancing test after CNC precision.?6 pics airfoil fan blades; Aluminum alloy, anodized treatment after sand blasting and chemical polishing.Advantages1.Low AC Cost2.Improve working climate & employees productivity3.Nature Air Cooling &Ventilation4. Keep healthy and large fresh Air Reducing bacteria,fog, mildew caused damage Drying the Wet Areas.ApplicationCommercial area:Exhibition center, 4S shops,large terminal market,supermarket.Recreation&Entertainment: