... , 2,Low noise 3,Low energy consumption 4,Long service life poultry farm fan1,Large air flow ... ,2,Low noise 3,Low energy consumption 4,Long service lifepoultry house fanThe fan blade is stainless ... caused after long time working of metal in the factory cooling, for example broken and air ... (bearings), high intensity, low noise, long service life.4.Variety sizes of shape and install conveniently ...