Keep your ConairPure Medium Room Air Purifier (model AP04) operating at peak efficiency with this 3-in-1 air purifier replacement filter. Breathe easier knowing you have a replacement filter on hand to ensure your air purifier continues to remove dust, pollen, volatile organic compounds, smoke, pet dander and other particles from the air you breathe. This combination of nylon prefilter, true HEPA filter, and carbon cotton filter is a must for maximizing air filtration in areas up to 200 sq. ft. Filter life is 2,500 hours, but the filter indicator will illuminate in red at 2,200 hours, so you know it’s time for a replacement. 4.75" diam. x 8.75" h.