Filtrete Air Cleaning Replacement Filter for the #FAP01-RS Small Room Air Purifier and #FAP02-RS Medium Room Air Purifier. Filtrete air cleaning filter is 99.9% effective at capturing large allergens like pollen, mold spores and dust mite debris. Filter change indicator senses the particle accumulation on the filter, taking the guesswork out of filter change, no Ozone generation. Size: 15″ x 9″ x .75″ Better than HEPA at capturing airborne particles Filter captures 99.9% of large airborne particles and allergens like pollen, mold and dust mite debris Designed to fit #FAP01-RS Small Room Air Purifier and #FAP02-RS Medium Room Air Purifier Filter change indicator senses the particle accumulation on the filter Taking the guesswork out of filter change No Ozone generation.