The conical air channel is designed to remove dust residues that negatively affect process performance. It consists of a conical hood with large plexiglass doors for inspection and a rotary distributor with blades, activated by an air flow. The high efficiency is guaranteed by controlling the exhaust air speed of the turbine distributor in relation to the conical exhaust chamber. A telescopic tube with vertical and horizontal adjustment allows the centering of the incoming product. The input position of the power supply, rotatable 360°, simplifies installation.