PUREBURG CAP-500FPK Replacement Filter Compatible with Cuisinart CAP-500 Air Purifier,2-Pack(4 Filters) H13 HEPA 3-Stage Filtration Activated Carbon 2-in-12 Pack(4 Filters), H13 3 Stage Filtration True HEPA Filters Compatible with Cuisinart CAP 500 Air Purifier CAP 500FPK H13 True HEPA capture 99. 97% of PM2. 5 dusts PM2. 5 down to 0. 3 microns in size. Remove large and PM2. 5 particles, including dust, common pollutants ,Activated carbon reduce Chemicals VOCs, tobacco smoke, PM2. 5,common household bad smell Please replace regularly to keep your machine fresh and clean. For the best performance, clean