The AeraMax Pro Hybrid Filter includes half True HEPA and half Activated Carbon Filters in one for enhanced air-cleaning power. True HEPA filter captures 99.97% of airborne particles as small as 0.3 microns, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores, pet dander and cigarette smoke. Antimicrobial treatment provides built-in protection from the growth of odor causing bacteria, mildew, and fungi on the HEPA filter. Average filter life is approximately 12 months (depending on use).