76 the product will u201c bounce u201d to the other side of the separation plenum where it will engage the upright portion 96 and lower lip 94 of an inlet manifold louver the lower lip 94 redirecting the falling product back across again it this way the falling product can be tumbled by the inwardly extending lower lips of the manifold louvers to expose the surface of the granular product to the upward and transverse air flow through the apparatus for removal of fines and other materials and to expose the fines and foreign materials to the air flow to allow and facilitate its removal from the falling product thus cleaning it referring now to fig1 and 3b as the falling product encounters the lower lip 94 of the lower louver 88 it falls into a discharge hopper 204 hopper 204 may include a spring loaded or biased discharge gate 206 as shown the cleaned product 210 will fall out of the hopper 204 through a discharge chute 208 and into the appropriate product conveyor not shown to be conveyed away for use or transport as desired air can be moved e g forced or drawn through the separation plenum via a blower 12 blower 12 can create a negative air pressure within the apparatus 10 causing ambient air to enter the velocity control module 160 as indicated by arrow 38 and pass through the apparatus shown in fig1 to exit therefrom as indicated by arrow 28 more specifically ambient air.