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Exhaust fan is the best choice for cooling and ventilation of greenhouse and poultry house due to its favorable properties The characters are as follows:1.Stainless steel fanleaf ,no distoration, no breaking, aesthetic and high durability;2Adopted automatic belt up and tight to ensure the belt not pine and drop3.High-intensity six blades,impeller is produced aluminum magnesium alloy, light high intensity,goos realilience4.High precise microcomputer aided manufactureed systeem :reasonable leaf angle ,high-strength,big air-flower,no distortion ,no breaking ,no noise5. France imported bearing: high intensity ,low noise and long service life