Replacement Filter for Blueair Blue Pure 411/411+ & Blueair 3210 Air Purifier True H13 HEPA Filter with Activated Carbon Filtration efficiency for 0.1 micrometre particles reaches up to 99.97%, effectively capturing pollen, pet dander, and other airborne particles. Features a highly developed pore structure, large specific surface area, strong adsorption capacity, and high strength. Effectively removes household odors including smoke, chemicals, and volatile organic compounds (VOCs). Designed for superior performance with excellent noise control, craftsmanship, increased capacity, and extended filter life without compromising air purifier efficiency. Clean Air Delivery Rate (CADR) remains consistent with original filter performance after replacement. Replacement recommended every 6 months when used 24 hours a day to maintain optimal air purifier performance for Blueair Blue Pure 411, Blueair Blue Pure 411+, and Mini air purifiers. Compatible models: Blueair Blue Pure 411, Blueair Blue Pure 411+, and Mini air purifiers. Please verify your air purifier model before purchase. Color: White Material: Filter paper + activated carbon cotton Package Contents: 1 x Replacement Filter Note: Light shooting and different displays may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.