The Cyclone Assembly includes the inner and outer cyclone. The cyclones play a large role in Multi Cyclonic Separation System. This cleaning system has two stages. The first, or outer cyclone, separates out the larger debris allowing the second stage, or inner cyclones, to separate the fine dust. This sophisticated separation system means that less dirt and debris has to be processed by the vacuums filters, allowing them to stay cleaner longer so the vacuum can continue to provide powerful, non-stop suction. Your vacuum may have reduced performance if dust collects in the cyclone, make sure to check for dust regularly. To clean, wipe cyclones with a wet cloth. Take apart the cyclones to rinse and let air dry overnight. Never put wet parts & pieces into the machine. Lift-Off Vacuum Cyclone Grille 2032444