Honeywell HRF-C1 HepaClean® Replacement Filter, Type CHepaClean Replacement Filter captures up to 95% of particles that are 2 microns and larger (From the air that passes through the filter). Helps remove common household odors, replace approximately every 6 months. Filter C replaces 16216 filter 95% efficient HEPA Type filter (From the air that passes through the filter) Helps reduce unpleasant odors such as pet, cooking, and smoke odors (From the air that passes through the filter) Replace every 6