Perfect Compatibility: 𝟓𝟏𝟏𝐢 𝐌𝐚𝐱 𝐅𝐢𝐥𝐭𝐞𝐫 is perfectly compatible with 𝐁𝐥𝐮𝐞𝐚𝐢𝐫 𝐁𝐥𝐮𝐞 𝐏𝐮𝐫𝐞 𝟓𝟏𝟏𝐢 𝐌𝐚𝐱 Air Purifier, Note: Only compatible with Blueair Blue Pure 511i Max Air Pu-ri-fi-er. 𝐍𝐎𝐓𝐄: 𝐍𝐨𝐭 𝐜𝐨𝐦𝐩𝐚𝐭𝐢𝐛𝐥𝐞 𝐰𝐢𝐭𝐡 𝐁𝐥𝐮𝐞 𝐏𝐮𝐫𝐞 𝟓𝟏𝟏/𝟓𝟏𝟏 𝐀𝐮𝐭𝐨, 𝟒𝟏𝟏𝐢 𝐦𝐚𝐱, 𝟒𝟏𝟏𝐚 𝐦𝐚𝐱, 𝟑𝟏𝟏𝐢 𝐌𝐚𝐱, 𝟑𝟏𝟏, 𝟐𝟏𝟏+/𝟐𝟏𝟏+ 𝐀𝐮𝐭𝐨, 𝟏𝟐𝟏 𝐞𝐜𝐭 High Quality Material: Blue 511i Max replacement filter is made of high-quality non-woven white filter and activated carbon and can adsorb 99.99% of air particles, dust, lint, pet fur, pet odor, cooking smell (with a diameter as small as 0.03 micrometers), bringing a healthy environment to your family 2-in-1 Efficient Filtration：Blue Pure 511i Max Filter adopts double-layer filtration technology, which absorbs pet plush、household waste, volatile organic compounds and smoke components through white pre filters and carbon filters, bring you green life Installation and Regular Replacement: Simply remove the packaging to replace the old Blue 511i Max filter without any tools. Recommended to regularly replace the Blue Pure 511i Max filter within 6-8 months to maintain The Freshness And Cleanliness Of The Machine Customer Service: Including 2 cost-effective Blue Pure 511i Max replacement filters. NXBHG Store has been specializing in bringing each family freshing air with providing customers premium quality and affordable replacement filter. We highly value customers' shopping experience and If you have any problems while using this replacement filter compatible wtih 511i Max replacement filter, please contact NXBHG Store customer service team without any hesitation. We are ready to help you to solve problems within 24 hours 511i Max Filter Replacement Compatible with Blueair Blue Pure F5MAX, Blue Pure 511i Max, Silent Air Cleaner,Premium Particle Dust Filter&Smoke Smell Odor Activated Carbon Filter, 2Packs