【PERFECT FIT】: This 511i max SmokeBlock replacement filter is fully compatible with Blue Pure 511i max Air Puri-fier 【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 511i SmokeBlock filter effectively 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 Blue Pure 511i Max SmokeBlock Filter Replacement Compatible with Blue Pure 511i Max Air Puri-fier, Blue Pure F5MAX