... double-intake centrifugal fans for intake air, model YDW4.5M1, air capacity for each fan: 10500m3/h.Exhaust air system is optional ... intake air, 5.5KW double intake centrifugal fan for exhaust air, model YDW-4.5S, air capacity is 15500 m3/h, with ... steel cover.Intake and Exhaust System5.5KW double intake centrifugal fan, model YDW-4.5S, air capacity:15500 M3/h.Filtering SystemExhaust ...