The Flow A3 responds to changes in air quality and automatically adjusts its performance in Smart Mode to ensure efficient cleaning. This allows you to feel free and enjoy your time. The spiral air outlet creates an upward vortex that efficiently circulates clean air throughout the room, covering an area of up to 40 m². The Flow A3 is equipped with a multi-stage filter that captures micro dust (e.g., PM2.5), odors (e.g., acetaldehyde), and harmful substances in the air (e.g., formaldehyde). You will be alerted by two warning levels when the filter needs to be changed. With its compact design, the Flow A3 also fits into small spaces, and the intuitive touch control interface makes it easy to set the desired function. The Flow A3 has a minimal noise level of just 26 dB(A) in Sleep Mode. Even at maximum performance, the noise level is only 49 dB(A), comparable to the sound level of a conversation during dinner in a restaurant.