These are  medium pressure centrifugal fan functioning by creation of 4000 CMH to 12000 CMH air volume and a total pressure of 180/200 mm WG at a velocity ranging between 18 m/s to 20 m/s.The Inlet of  the Fan is connected with the Outlet of  a Big Cyclone and the Inlet of the said Cyclone  allows to make an air duct line comprising of various branches as required for the pre cleaning and cleaning  machines and also the windshifters at the elevator.feed hoppers.