MODEL COMPATIBILITY: The Filter-Monster Air Filter Replacement is compatible ONLY with Blueair Blue Pure 211+ Auto Air Purifiers FILTRATION: Exterior filter material is engineered to protect against airborne contaminants such as dust, pollen, dust mite matter, and pet dander. Promoting improved indoor air quality for a healthier home environment. CARBON MESH FILTRATION: Interior carbon mesh designed to help protect against airborne contaminants such as smoke, cooking odors, and VOCs (volatile organic compounds), reducing unpleasant orders and keeping your indoor air fresher and more enjoyable REPLACEMENT TIME: Depending on air quality environment and usage, it is recommended to replace the filter every six (6) months to help ensure the Blueair air purifier is running efficiently DIMENSIONS: The air filters approximate dimensions are exterior: 11.81” x 11.63" x 11.63" and filter thickness of 1.38". Interior: 11.81” x 8.88” x 8.88". At Filter Monster, we have over 25 years of experience helping customers breathe cleaner, healthier air with filtration solutions that combine performance, reliability, and value. Our BA211-FM1 filter replacement is compatible with the Blueair Blue Pure 211+ Auto air purifier. This filter helps to reduce airborne proteins and improved indoor air quality and helps to provide cleaner air around you. The 360-degree design provides excellent surface area to filter your air. This allows air to be drawn in and filtered for all directions, helping to ensure improved indoor air quality. To ensure effective filtration, it is recommended to replace the filter every six (6) months or more often depending on air quality and environmental factors. Each package includes one (1) high quality Filter-Monster Filter Replacement Compatible with Blueair Blue Pure 211+ Air Purifier. When purchasing Filter-Monster, you get more than a filter - you get peace of mind and real savings because you chose to purchase a high-quality, cost-effective solution to clean the air around you.