... appearance,big angle comply with Italy technology, 5052 Aluminium Alloy extensively used for plane blade,huge air volume and low noise.2 ... . 5. import rolling bearing 6. Fan Blade Pulley:casted aluminium alloy with light weight,high intensity,quick assemblyand anti corrosion. the ... power is relatively low, so the equipmentcosts and running costs for whole projects are less. 6.easy installing and a long ...