... *Low noise *Low energy consumption *Chinese CCC motor Floworld series Centrifugal Shutter System Exhaust FanThe fan blade is stainless steel , big air ... 1380mm(54″),1530mm(60″)nine kinds.5.We can manufacture A type belt or B type belt according to the sale ... , to smooth operating, reduce noise,enhance stability, extend service life.A.Bearing imported from France, high intension,low noise,long service ...