rue HEPA Filter captures 99.97% of airborne particles as small as 0.3 microns, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores, pet dander and cigarette smoke AeraSafe™ antimicrobial treatment provides built-in protection from the growth of odor causing bacteria, mildew, and fungi on the True HEPA filter Compatible with Fellowes® AeraMax® 90, 100 and DX5 Air Purifiers With normal usage, it is recommended that you change your filter every 12 months to keep your air purifier running at peak performance A filter change indicator on your Fellowes® AeraMax® Air Purifier conveniently notifies you when it's time to replace your True HEPA filter