The Air Channel is used for the removal of foreign matter which is lighter than the product by air. It is mounted on the front of the hopper and the peeler outlet. The feeding table in the product entrance provides a homogeneous flow of goods along the channel. Through the rear curtain adjustment bolts, which are moved all the way, the channel section allows to be adjusted as desired. Precise adjustment of the air velocity in the channel ensures that the required amount of light matter in the grain passing through the channel is separated.