2 Pack Blue Pure 311i Max AllergenBlock Filter Replacement Compatible with 311i Max Air Purifier, H13 Ture HEPA and High-Efficiency Activated Carbon Filters, Replacement Part #F3MAX

["Perfect Compatibility - This replacement filter is fully compatible with Blue Pure 311i Max air purifiers. Please double-check your device model number before ordering to ensure a proper fit.","Efficient 2-Stage Filtration - Features a 2-in-1 composite structure with a high-efficiency particulate filter and activated carbon layer, delivering strong and reliable all-around air purification.","Outstanding Filtration Performance - Captures fine airborne particles effectively while reducing common household odors, smoke, pet smells, and other unwanted gases for cleaner, fresher indoor air.","Premium & Durable Material - Made of high-quality non-woven fabric and activated carbon to ensure stable performance, low airflow resistance, and long service life under daily use.","Recommended Replacement Cycle - To maintain optimal air purifier performance, it is recommended to replace the filter every 6–9 months based on actual usage environment and operating time."]