【𝗣𝗲𝗿𝗳𝗲𝗰𝘁𝗹𝘆 𝗖𝗼𝗺𝗽𝗮𝘁𝗶𝗯𝗹𝗲 𝘄𝗶𝘁𝗵 𝟱𝟭𝟭𝗶 𝗠𝗔𝗫】These 511i Max replacement filters are ONLY compatible with 𝗕𝗟𝗨𝗘𝗔𝗜𝗥 𝗕𝗹𝘂𝗲 𝗣𝘂𝗿𝗲 𝟱𝟭𝟭𝗶 𝗠𝗮𝘅 Air Purifi-er. Not fit for other models. Please check your model before buying. 【𝗛𝗶𝗴𝗵 𝗘𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝗰𝘆 𝗙𝗶𝗹𝘁𝗿𝗮𝘁-𝗶𝗼𝗻】Combining the Nylon Preliminary filter, H13 True HEPA filter and Activated Carbon filter. 3 layer filtration attaches 99.97% of air pollutants, bringing your family fresh and pure air. 【𝗛𝟭𝟯 𝗧𝗿𝘂𝗲 𝗛𝗘𝗣𝗔 𝗙𝗶𝗹𝘁𝗲𝗿】This blue air 511i Max filter has the 99.97% filtration efficiency and intercepts particles larger than 0.3 microns. Attaches most air pollutants, such as dust, dander, pollen, smoke, and other small particles. 【𝗔𝗰𝘁𝗶𝘃𝗮𝘁𝗲𝗱 𝗖𝗮𝗿𝗯𝗼𝗻 𝗙𝗶𝗹𝘁𝗲𝗿】Premium granular activated carbon physically attaches unwanted odors and fumes, such as smoke, pet odors, cooking odors, VOCS, etc. Great for families with children and pets. 【𝗟𝗼𝗻𝗴𝗲𝗿 𝗟𝗶𝗳𝗲 𝗦𝗽𝗮𝗻】We recommend that you replace the blue pure 511i max filter every 6-12 months for optimal performance. The 511i Max air filter replacement can effectively take away pollutants, creating a fresh and healthy living environment for your family. 【𝗖𝗼𝘀𝘁-𝗲𝗳𝗳𝗲𝗰𝘁𝗶𝘃𝗲】2 Pack for Blueair Blue Pure 511i Max replacement filters are included in the package. We recommend that you replace the pure 511i max filter every 6-8 months for optimal performance. (Note: under normal conditions and environments) 【𝗖𝘂𝘀𝘁𝗼𝗺𝗲𝗿 𝗦𝗲𝗿𝘃𝗶𝗰𝗲】Lacvik provides the customer service. If you have any problems for the blue pure 511i max filter replacement, please contact us and we will try our best to solve the problem for you. It can work for your whole house, such as bedroom, living room, kitchen or office, etc. The 511i Max filter replacement can effectively take away pollutants, creating a fresh and healthy living environment for your family.