Keep your home purification system in tip-top shape by replacing the air filters every 3 to 4 months. When the time comes to make the switch in your Medify Air MA-15 Air Purifier, trust the Medify Air H13 HEPA Replacement Filter Set to keep your air clean, clear, and breathable. This air purifier replacement filter pack is compatible with the Medify Air MA-15 air purification systems only (unit not included). Since this appliance features a dual filtration system, you'll need to replace both filters at the same time for best results. Designed to keep your air clean, these air filters are medical-grade efficiency. This means the filter removes 99.9% of particles down to 0.1 microns. This air purifier filter pack also uses a 3-stage system with a washable pre-filter, HEPA H13 media to eliminate harmful particles, and an active carbon filter that removes unsavory odors throughout your home. Breathe easier and comfortably in your home by replacing an old or dirty air filter with the Medify Air H13 HEPA Replacement Filter Set.