to avoid such a restriction application_number US 87283686 A description one embodiment of the invention is illustrated in fig1 3 wherein a conventional vacuum duct 2 is positioned above a wire mesh conveyor belt for removal of light pecans such as 34 pops 34 and shriveled pecans 22 from heavier acceptable pecans 20 as the pecans are conveyed underneath vacuum nozzle 4 these fig1 3 also illustrate the improvement to the above described prior art namely the provision of positive fluid pressure from pressure nozzle 14 which is situated on the opposite side of the conveyor belt 16 from that of vacuum nozzle 2 fluid pressure is supplied to outlet nozzle 14 via ducting 12 pressure plemum 10 and fan 6 this embodiment overcomes the problems experienced when only a vacuum has been used namely the restriction of the vacuum nozzle by a light pecan causing an increased vacuum to be felt by the remaining pecans which resulted in a number of acceptable heavier pecans 20 being extracted by the vacuum duct 2 along with each light pecan 22 in this improvement over the prior art the negative pressure in duct 2 and or spacing of nozzle 4 from conveyor belt 16 is adjusted such that the negative pressure in and of itself is insufficient to evacuate the light pecans 22 or for that matter to raise the light pecans 22 to a position of restricting the nozzle 4 sufficiently to evacuate any good pecans 20 at the separation station the.