【PERFECT FIT】: This Blue Pure 311i Max AllergenBlock filter replacement is fully compatible with Blue Pure 311i Max Air Purifier. 【NOTE】: This Blue Pure 311i Max Filter AllergenBlock is designed exclusively for compatibility with Blue Pure 311i Max Air Puri-fier. Please verify the model number before making your purchase 【SUPERIOR QUALITY】: Blue Pure 311i Max AllergenBlock Replacement Filter for Blue Pure 311i Max Air Purifier , effectively capturing a remarkable 99.97% of particles as small as 0.1 microns, and cleans pet dander, pollen, and dust. The activated carbon filter efficiently tackles household odors and harmful gases, safeguards you from household odors 【OPTIMAL PERFORMANCE MAINTENANCE】: For the ongoing top performance of your Blue Pure 311i Max AllergenBlock Air Purifier, based on actual usage the filter should be replaced within 9 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 Leemone 2 Pack Blue Pure 311i Max AllergenBlock Replacement Filter