Used for separating less dense foreign materials from the grain with the aid of air. Can be installed in same floor to the exits of separator or bran finisher. The plate at the entrance of the canal spreads the grain evenly thanks to the vibration driven by vibrating motor or the vibration of separator.  Thanks to the channel size adjusting rear curtain foreign sustances cen be easily separated.  With the aid of top flap, suction power can be adjusted so as to improve separation of foreign substances. Besides illumination and transparent rear glass facilitates visual inspection.