Exhaust fan/ventilation fan/poultry equipment 1)stainless steel fan blade 2)automatic belt tensioner 3)imported bearings DJF-A series swung frop hammer exhaust fan with CE and CCC cetificate/ventilation fan/poultry equipment1 fan blade is stainless steel,big air volume,without distortion,no broken,attractive and durable2 Adopts automatic belt tensioner which can adjust up and tight so that the ...