[True H13 HEPA Filter] Filtration efficiency for 0.1 micrometre particles is up to 99.97%, capturing pollen, pet dander, and other airborne particles. [Activated Carbon Filter] Features 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). [Superior Performance] Offers excellent noise control, craftsmanship, higher capacity, and extended filter life without compromising air purifier performance. The clean air delivery rate (CADR) remains consistent after replacement. [Replacement Recommendation] To maintain optimal performance, replace the filter every 6 months when used 24 hours a day. [Compatible Models & Attention] Designed for use with 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 Includes: 1 x Filter. Note: Lighting and display differences may cause slight color variations. Measurement error allowance: +/- 1-3 cm.