Efficient preliminary filter. Already filters most of the dust and thus protects the main filter. Low-dust, quickly replaceable and cost saving. Two-stage filter system: The majority of the airborne dust is caught by the preliminary filter. This protects the main filter|Quick filter replacement: The preliminary filter can be easily removed and installed without any tools. Pre-filtering of airborne dust, protection of the main filter of the SYS-AIR. Protects the main filter|Easy to change. Thanks to the two-stage filter system, the majority of the dust is already caught by the preliminary filter.|Quick, easy and tool-free. for pre-filtering of airborne dust for the SYS-AIR air purifier. for SYS-AIR
