This fits your . Make sure this fits by entering your model number. Fits Bionaire models CH3550 and CH3580. Bionaire HEPA air filter cartridge (Superior to hospital grade!) Eliminates 99.97% of all airborne particulate pollutants. A premium filter for cleaner, healthier air. Measures approximately 15 3/4″ x 18 3/4″ x 4 1/4″ For optimum performance, replace […]