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Motor Brand: Chinese motor and Siemens motor . Certificate: CCC Protection class: IP55 grade Insulation class: F grade Volt and frequency:Customized Production:With phase failure protective device to ensure motor working well Advantage: Pure copper wire,High-efficiency,Energy-saving.Fan blade which punching formed 1. Material : Krupp 430 stainless steel, thickness 1.2mm 2. Diameter: 1270mm Advantage: Large air flow, no deformation, no fracture, no dust, attractive and durable. Note: Blade material also have galvanized sheet, aluminum alloy for option.Opening system-Centrifugal System 1. Material:High quality Nylon PA66 2. Guide Rod:304 stainless steel with special material outside,high strength,no rust,reduce friction. 3. Rivet:304 stainless steel,wear-resisting,no rust. Advantage: It can keep the shutters open at complete 90 degree to ensure the lowest air resistance and biggest air volume. When it is close,the tight sealing can efficiently block light and wind into the poultry house.Fan belt pulley Fan belt pulley and flange are made of aluminum-magnesium alloy by pressure casting. Good outlook with lightweight. Especially to reinforcing rib to increased strength. No broken . Long service life. The angle of blade hub is designed after double tested which can be fix with blade exactly. Advantage: Small wind resistance,Large air flow, attractive and durable.Frame: Thicken galvanized sheet We has advanced production technology with automatic equipment. professional production line, NC-based professional equipment.Auto punching and bending. Highly-accurate. Materials is made by 275g coating weight galvanized sheet. Advantage: High strength,Strong corrosion resistanceBelt We have Chinese belt and Japanese Mitsubishi brand belt for customer choice. Long service life and no repair. Modified B type belt,so that service life increase 3 times than Type A.Shutters open/close automatically No electricity ventilation,Opening centrifugal push-pull system,then Shutters can open and close automatically. Advantage: Windproof ,Rainproof.Balance Tester Fan blades are adjusted by Intalligent dynamic-balance tester, the weight tolerance of each blade is controlled within 1g. Advantage: Ensure the fan smooth running,lower vibration,less noise,increase stability.