Fabricated CRCS Sheet construction. Compact Design Minimal maintenance. Â Operation The product enters the macine through feed spout on top (center) of the machine and is spread in a thin layer.Aspiration hoods are connected to a central aspiration system. Thus flowing air passes through this layer of falling grains carrying all light impurities from the product. The clean stock is collected at the bottom of the machine and passes through the connected spout.