... 1,Large air flow , 2,Low noise 3,Low energy consumption 4,Long service life floworld series greenhouse exhaust fanThe fan blade is ... own strength efficiently;3.France imported axletree(bearings), high intensity, low noise, long service life.4.Variety sizes of shape and ... , extend service life.A.Bearing imported from France, high intension,low noise,long service life.B.The high efficient and energy ...