The Austin Air HealthMate is designed to address your everyday air quality concerns. It removes a wide range of airborne particles, chemicals, gases and odors and will significantly improve the quality of air in your home. Filter Specifications : STAGE 1 – Large Particle Pre-filter. Removes particles easily seen by the naked eye (e.g. dust, hair and pet dander) STAGE 2 – Medium Particle Pre-filter. Removes small to medium size particles (e.g. molds, spores and pollen) STAGE 3 – Over 780 cubic inches of Activated Carbon and Zeolite. Removes chemicals, gases and odors. STAGE 4 – 60 sq. ft. of True Medical Grade HEPA. Removes 99.97% of all particles larger than 0.3 microns and 95% of all particles larger than 0.1 microns.