COMPATIBLE WITH BLUE PURE 211 plus: Blueair Combination Particle plus Carbon Replacement Filter compatible with Blue Pure 211 plus air purifiers (non-auto); not compatible with Blue Pure 211 plus Auto air purifier | | FILTERS BUILT TO LAST: Using a 360-degree air intake and up to 4x the filter surface area, the Genuine Blue Pure 211 plus Auto Particle and Activated Carbon Filter lasts on average 6 months to a year; optimizing air flow and performance over time | | AUTOMATED FILTER REPLACEMENT: Subscribe save up to 10% on auto-delivered filters when replacement is needed; We recommend replacing your filter about every 6 months when used 24 hours a day | | REMOVES EVEN TINIEST AIRBORNE PARTICLES DOWN TO 0.1 MICRON: Particle filter removes airborne particles such as pollen, pet dander, bacteria, mold, viruses, and dust from your indoor environment* | | TRAPS HOUSEHOLD ODORS: A layer of carbon mesh traps light household odors, smoke, chemicals, and volatile organic compo.