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 developed pore structure, large specific surface area, strong adsorption capacity, and high strength to help remove household odors including smoke, chemicals, and volatile organic compounds (VOCs). Designed for superior performance with excellent noise control, craftsmanship, higher capacity, and extended filter life without compromising air purifier efficiency. Clean Air Delivery Rate (CADR) remains consistent with original filter performance after replacement. For optimal performance, replace the filter every 6 months when used 24 hours a day. Compatible with Blueair Blue Pure 411, Blue Pure 411+, and Mini air purifiers. Please verify your air purifier model before purchase. Color: White Material: Filter paper + activated carbon cotton Package Includes: 1 x Replacement Filter Note: Lighting and display differences may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.