1.The Medify Air MA-WM45 uses True HEPA H13 filters with three layers of filtration: pre-filter, True HEPA H13, and active carbon composite for odors.
      *True HEPA H13 or better removes 
        99.9% of particles down to 0.1 
        microns.*
2. True HEPA H13 Filter
       *The high-efficiency True HEPA H13 
         filter is tested to remove 99.9% of 
         particles down to 0.1 microns.*