【PERFECT FIT】: This 511i max replacement filter is fully compatible with BLUEAIR HEPASilent Air Cleaner. The carbon component in our product is made from FSC-certified charcoal powder 【NOTE】: Not compatible with Blue Pure 511 or 511 Auto, 211+ and 211+ Auto, 411i max, 411a max, 311, 121, or other models. Please verify the model number before making your purchase 【SUPERIOR QUALITY】: The HEPA filt-er effectively cleans a remarkable 99.97% of particles as small as 0.1 microns, and cleans pet dander, pollen, and dust. The activated carbon filter efficiently cleans household odors from smoking, pets, and cooking fumes 【OPTIMAL PERFORMANCE MAINTENANCE】: For the ongoing top performance of your Blue Pure F5MAX Air Puri-fier, based on actual usage the filter should be replaced within 6 months 【OUR DEAR CUSTOMERS】: If you encounter any quality issues, please don't hesitate to contact our 24/7 Leemone customer service team. We're here to address and resolve any concerns you may have promptly 2 Pack Blue Pure 511i Max Filter Replacement Compatible with Blue Pure 511i Max Air Puri-fier, Blue Pure F5MAX