Nispira Replacement Filter for Blueair Blue Pure 311i Max Air Purifier, True HEPA & Activated Carbon, Compatible with F3MAX, 3-Pack

["Designed as a compatible replacement filter for Blueair Blue Pure 311i Max air purifier, offering a reliable option to support everyday indoor air freshness.","Features an integrated activated carbon layer that helps reduce common household odors such as smoke, pet smells, cooking odors, and chemical-related scents.","Constructed with advanced polypropylene filtration media to help improve overall air clarity and support consistent airflow during daily use.","Built with a 360-degree air intake design and an expanded filter surface area compared to many standard replacement filters, helping promote efficient operation.","Includes 3 replacement filter; filter dimensions measure 13.4 x 11 x 11 inches. Recommended replacement interval is approximately every 6 months for optimal performance.","Quality meets or exceeds the leading national brand's."]