True HEPA Filter: Removes up to 99.97% of airborne allergens as small as 0.3 microns Prefilter: Captures dust, pet hair, lint, dirt and larger particles Odor Filtration: Activated carbon filter; reduces household odors and VOCs Perfect Match: Compatible with Homedics Smart Console Air Purifiers; models AP-C500, AP-C550; replace every 12 months for optimal performance and fresher, cleaner-smelling air What’s in the Box: (2) True HEPA Replacement Filter