CONE FAN(BUTTERFLY TYPE)Cone type design,low noise,strong wind,strong extraction.PVC shutters,antioxidant,light weight,no deformation,flexible open and anti-air back.High strength alumium magnesium allou hub wuth ribs,it is light weight,high strength and good tensile.Using the imported bearing,high strength,low noise and durable.Stainless Steel fan balde,no distortion,no fracture,beautiful and durable.High performance energy saving fan motor with national standard,CCC certificate,Protection class:IP55,Insulation Class:FPlating round support structure,motor located in the center of fan,small wind resistance,the structure is more reasonable.Wind capacity is 46500m3/h.