Premium HEPA filter compatible with Blueair Models 201, 203, 205, 215B, 250E, 270E, and 303 air purifiers. It replaces original Blueair 200/300 Series Particle Replacement Filter. It is proved to capture 99.9-Percent of large airborne particles and allergens like pollen, mold and dust mite debris. One filter can last from 6 months to a year based on normal use. Quality meets and exceeds leading national brand. Blueair is registered trademarks of the original manufacturer. This product is high quality filter by Nispira. Any use of the Blueair brand name or model designation for this product is made solely for purposes of demonstrating compatibility.