【Perfect Compatibility】- 2 pack blue pure 511 replacement filters 𝐎𝐍𝐋𝐘 compatible with Blueair Blue Pure 511 Air Purifier. Please confirm your air purifier models and the filter dimensions before purchasing. Filter Height: 8.27in (21cm), Width: 7.87in (20cm). ❌❌❌𝐍𝐨𝐭𝐞: 𝐃𝐨 𝐧𝐨𝐭 𝐟𝐢𝐭 𝟓𝟏𝟏 𝐀𝐮𝐭𝐨, 𝟓𝟏𝟏𝐢 𝐌𝐚𝐱, 𝟑𝟏𝟏 𝐀𝐮𝐭𝐨,𝟒𝟏𝟏, 𝟒𝟏𝟏𝐢 𝐌𝐚𝐱, 𝟐𝟏𝟏𝐢 𝐌𝐚𝐱, 𝟑𝟏𝟏𝐢 𝐌𝐚𝐱, 𝟑𝟏𝟏𝐢+𝐌𝐚𝐱. 【Superior Craftsmanship】- Our Top-tier 511 air filter features high-quality non-woven fabric, incorporating HEPA and activated carbon for enhanced performance in your 511 filter replacement. This replacement filter for Blueair 511 air purifier adopt advanced lower energy consumption and lower density structure, ensuring higher efficiency and less pressure to ensure maximum filtration and longer lifespan 【High Efficiency Filtration】- Our Blue Pure 511 filter replacement is designed with a double layers high efficiency filtration system. The 511 HEPA filter effectively attaches 99.97% of airborne particles down to 0.3 microns such as pollen, dust, pet dander, and other tiny particles. Additionally, the Activated Carbon Filter swiftly and efficiently tackles household odors from pets, cooking, smoke, wildfires, and VOCs, ensuring a fresher and cleaner indoor environment 【Easy to Replace & Install】 - These 2 pack Blue Pure 511 air purifier filters features a collapsible design for space-saving convenience and excellent cost performance. It is recommended to replace the 511 air filter EVERY 6 MONTHS, or depending on air quality and usage frequency. The Blue Pure 511 filter's small tags facilitate easy removal and replacement without the need for tools 【Purchase with Confidence】 - We are committed to delivering superior-quality replacement filters for air purifiers, ensuring that all customer needs are met for the best shopping experience in clean appliance replacement parts. If you encounter any issues with our 511 Filter Replacement, please don't hesitate to contact us, and we will respond promptly within 24 hours. Filter made of FSC-Certified paper 511 Filter Replacement Compatible with Blueair Blue Pure 511 Air Purifier, 2-in-1 HEPA Filter System, 2 Pack