4-stage cleaning system filters 99.97% of all airborne pollutants as small as 0.3 micrometers (viruses, allergens e.g. pollen, dust mites, mold spores, animal dander, cigarette smoke) Performance: 5 air changes/hour (room with 28m²) and 3 air flows/hour (room with 42m²) AeraSafe™ - the integrated antimicrobial protection prevents the accumulation of odor-producing bacteria, mold and fungi AeraSmart™ sensor constantly monitors the air quality and automatically adjusts the fan speed. Aera+™ mode increases the air flow by up to 50% during allergy season to remove allergens from the air Filter change indicator indicates when the carbon or True HEPA filter needs to be changed Filter can be pulled out from the side for easy changing