The Blueair Blue Pure 211+ Particle and Carbon Filter is a combination filter that catches virtually every airborne contaminant down to a virus in size: pollen, dust, pet dander, mold spores, allergens and bacteria. The active carbon is also effective against smoke, odors, gases and VOCs. And like all other parts in your Blue air purifier, the material is 100% recyclable. Practical and Efficient Due to the unique fiilter design and the HEPASilent technology the this air purifier, Blueair delivers a high Clean Air Delivery Rate (CADR) at the lowest possible noise and energy consumption. Large filter surface area prevents premature clogging and ensures a long lifetime. Higher Airflow and Capacity The entire bottom half of all Blue units consist of an advanced filter. The enormous filter area works its hardest for a long, long time. It’s also less dense, with millions of ultra-thin fibers of different sizes in different layers. The result: higher airflow and higher capacity. Easily Replaced When you finally need to replace your Blue Pure filter, you don’t have to be an engineer, all you need is 2 index fingers and one click.