The Air 4000i efficiently filters pollutants from the air and can be comfortably operated via an app. Monitoring and control are carried out through the free Bosch HomeCom Easy app. The collected data is encrypted and protected on European servers in Germany. The Air 4000i meets the current cyber security standards (2025). It offers functions such as on/off, mode change, and timer (time-off). With a performance (CADR) of 300 m³/h, it filters air in rooms up to 62.5 m². The color of the light ring continuously indicates the air quality status. In auto mode, the performance adjusts to the room size and air quality. In quiet mode, the display is turned off, and the air purifier operates quietly. The durable filter consists of a pre-filter, activated carbon filter, and HEPA layer, and can be replaced in just one step.