Austin Air filters address the complete spectrum of air cleaning, removing sub-micron particles, noxious gases and chemicals. Austin AirÕs 360-degree intake system draws air into all sides of the HealthMate Jr.ª, passing it through a 4-stage filter. The result, more clean air delivered faster and more efficiently than any other air cleaner on the market. The 4-stage filtration systems works like this: 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 - 15 lbs. of Activated Carbon/Zeolite Blend - Removes chemicals, gases and odors (e.g. sulfuric acid and ammonia), STAGE 4 - 60 ft. of True Medical Grade HEPA - Removes harmful micro-organisms - (e.g. bacteria and viruses) . The Austin Air HealthMate Jr. cleans up to 700 square feet, with 6.5 lbs. of Carbon-Zeolite mix for the absorbtion of odors, gases and chemicals. Every minute, over 200 cubic feet of air passes through 6.5 pounds of Activated Carbon and over 30 square feet of True Medical Grade HEPA, providing air so clean it could change your life and how you sleep. If not satisfied, return it for a refund within 30-days. Certified to remove 99.97% of aiborne particles 0.3 microns and larger, and 95% of airborne particles 0.1 microns and larger. Height 16.5", Width 11" x 11". Weight 18 lbs.