Pneumatic cyclones are used for separating product from conveying air. Minimizes air loss from the system. The air and product mixture sucked by pneumatic fan enters the cylone tangentially; materials more dense then air circulate around the cylone inner surface due to centrifugal force and fell down to the bottom exit,   while air separated from the mixture leaves the cyclone from top center. Amount of air to be discharged can be controlled by the throttle at cyclone's exit.