Allerair s Hepa-carbon combination neutralizes airborne irritants with its dual action cleaning power offering you the best air filtration available without generating additional pollutants like ozone. The Micro Hepa Filter requires no tools and is easy to install usually in less than a minute. It removes 99.97% of large airborne particles and allergens that can greatly hinder your breathing. These filters are available in packages of one and have a lifespan of up to twelve months depending on your amount of usage. AllerAir air purifiers use a five-stage filtration process: A pre-filter to capture large particles. A medical-grade Hepa filter guaranteed to trap 99.97% of airborne particles 0.3 Microns in size. An activated carbon filter with pounds of granular virgin carbon to filter out chemicals gases and odors. Two anti-microbial filters. Compatibility: Use with AllerAir 5000DS Airmedicexec and Airmedic + Exec. - SKU: ALLRRI005