Four-stage purification system allows air to undergo separate processes before returning purified air to the room. The true hepa filter captures 99.97% Of airborne particles as small as 0.3 Microns, including pollen and other allergens, dust mites, mould spores, pet dander and cigarette smoke. Furthermore, the aerasafe antimicrobial treatment is a built-in protection from the growth of odour causing bacteria, mildew and fungi on the true hepa filter. Also includes aerasmart sensor that monitors the air quality and automatically adjusts the fan speed to keep your air purified. Blue, amber and red lights indicate the purity of your air. Aera+ mode is designed for peak allergy conditions and increases air flow by 35% to remove allergens from your air. Filter change indicators let you know when it is time to replace your carbon and true hepa filters. 3 Year limited warranty.