Replacement Filter for Blueair Blue Pure 411/411+ & Blueair 3210 Air Purifier True H13 HEPA Filter Filtration efficiency for 0.1 micrometre particles is up to 99.97%, capturing pollen, pet dander, and other airborne allergens. Features an advanced activated carbon layer with a developed pore structure, large specific surface area, strong adsorption capacity, and high strength. Effectively reduces household odors from smoke, chemicals, and volatile organic compounds (VOCs). Designed for superior performance with excellent noise control, durable construction, increased capacity, and extended filter life without compromising air purifier performance. The clean air delivery rate (CADR) remains consistent 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 model before purchase. Color: White Material: Filter paper + activated carbon Package Contents: 1 x Filter Note: Light lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.