poultry fan for poultry farms sheds 1)high efficient and energy-saving, 2)low noise, long service Poultry ... automatic, and makes it dustproof, waterproof. 2)Motor: the high efficient and energy-saving motor with protection grade: IP55 , insulation class ... magnesium alloy injection moulded, light weight, high-strength. 7)Bearing:France imported bearing, high intensity, low noise, long service life ...