Bionaire HEPA air filter cartridge fits Bionaire models SE2080, SH1240, SH1260, SH1840 amp;amp; SH1860. This filter is superior to hospital grade and measures approximately 12 x 12 1/8 x 2 3/8. It eliminates 99.97% of all airborne particulate pollutants. A premium filter for cleaner, healthier air, because it reduces dust, pollen, mold, spores, animal dander, bacteria, tobacco smoke, and other air contaminants that may cause allergies, asthma, and sinus infections. For optimum performance, replace filter once every 12 months.