The MinusA3 takes a holistic approach to air purification. The unit relies on a six-stage filtration process to achieve high cleaning performance. A smart filter tracking system provides an automated schedule for cleaning and replacement, thus reducing maintenance and associated costs. The filter performance is based on the quality of the air in the room and is adjusted accordingly. The air purifier can be set up or mounted on a wall – in the normal orientation or, when rotated by 180 degrees, directly under the ceiling.