FIELD: agriculture; machine building.SUBSTANCE: invention relates to the agricultural machinery and can be used in devices for after-harvesting treatment of grain. Air-cleaning system of a grain separator contains a loading hopper, air channels before and after lattice cleaning of grains, sedimentary chambers with fans installed on them. Each fan is connected to its sedimentation chamber by means of a confuser of rectangular section, tapering from the width of the sedimentation chamber to the entrance to a fan.EFFECT: air-cleaning system of a grain separator provides efficient cleaning of grain from light impurities.1 cl, 1 dwg
