Bring clean air into your home or office. The True Hepa Replacement Filter removes up to 99.97% of airborne allergens as small as 0.3 microns. It features a built-in prefilter that traps larger particles and an activated carbon filter to reduce pet smells, household odors. Performance is best when the filter is replaced every 12 months. Compatible with the Homedics Smart Tower Air Purifier, model Ap-T200.