The Fellowes? AeraMax™ DX5 True HEPA Filter captures 99.97% of particles and impurities as small as 0.3 microns, including mould spores, pollen, dust mites, most airborne microbes, allergens and cigarette smoke. Built-in AeraSafe™ Antimicrobial treatment protects from the growth of odour causing bacteria, mildew and fungi. Filter is compatible with the Fellowes? AeraMax™ DX5 Air Purifier. Replace the True HEPA filter approximately every 12 months to ensure that the Air Purifier continues to operate optimally.