【Compatibility】: This 511i Max replacement filter is fully compatible with BLUEAIR HEPASilent Air Cleaner, Blue Pure F5MAX, and Model Blue Pure 511i Max. 【Attention Please】:Not ❌compatible with 211+ and 211+ Auto, 411i max, 411a max,511, 311, 121, or other models, Please check the model number before placing the order. 【H13 True HEPA Air Filter】Our 511i Max replacement filter made of H13 true HEPA air filter and a high-efficiency activated carbon filter for good clean filtration and performance. It's can attach most airborne particles, like dust, pet dander, pollen, household odors from smoking, cooking and pets. 【High Efficiency Filtration】This Blue Pure 511i+ Max air filter are capable of attaching 99.97% of airborne particles down 0.01 microns, and the carbon filter helps you solve the problem of unpleasant odors, so no need to worry about any air problems anymore, just enjoy a healthy life with your family. 【Cost-Effective】Package includes 2 Pack F5MAX replacement filter for Blue Pure511i max air purifier. Keep a close eye on your filter life, it is better to replace filter every 6-9 months for optimal performance depending upon your usage and environment. 【Shop With Confidence】Smilyan adhere to provide all customers with the best customer service experience. If you have any quality problem for Blueair 511i max replacement filter during usage, please contact our customer service team. Filter made of FSC-Certified paper 2 Pack Blue Pure 511i Max Filter Replacement Compatible with Blueair 511i Max Air Purifier, Blue Pure F5MAX, H13 True HEPA & Activated Carbon Replacement Filter