The Blueair 411 Particle and Activated Carbon Filter is expertly sized to fit exclusively with the Blue Pure 411, 411+, 411 Auto, and Mini Air Purifiers. The activated carbon and particle filter allow it to filter the air in rooms up to 161 square feet 5 times per hour. Removes household odors, chemicals, and gases, as well as 99.97% of airborne particles, like pollen, dust, and viruses. A high CADR (clean air delivery rate) lets you know you’re getting the most out of your purification unit. Dimensions: H: 11.1" x W: 8" x D: 1.9" (200 x 160 x 290 mm) Weight: 1.1 lbs Shipping Weight: 1.1 lbs Filter Type: HEPA Synthetic Polypropylene fibers free of harsh chemicals and binders, prevent moisture and bacteria growth and are naturally anti-bacterial as well as fiber shred resistant. Activated Carbon Mesh: The carbon mesh is bonded with the polypropylene fibers to filter out harmful chemical and smoke odors such as VOC's. Effective Filter Area: 161 Sq. Ft. Filter Recycling: Yes, the plastic constructions makes this filter 100% recyclable. Number of Filters: 1 Recommended Filter Change: Every six months (4,380 hrs), depending on use.