[True H13 HEPA Filter] The filtration efficiency for 0.1 micrometre particles is as high as 99.97%, capturing pollutants such as pollen and pet dander. [Activated Carbon Filter] Features a developed pore structure, large specific surface area, strong adsorption capacity, and high strength, effectively reducing household odors including smoke, chemicals, and volatile organic compounds (VOCs). [Superior Performance] Designed with noise control, precise workmanship, increased capacity, and extended filter life without compromising air purifier performance. The Clean Air Delivery Rate (CADR) remains consistent with the original filter after replacement. [Replacement Recommendation] To maintain optimal performance of your Blue Pure 411 air purifier, Blue Pure 411+ air purifier, or Mini air purifier, it is recommended to replace the filter approximately every 6 months when used continuously for 24 hours a day. [Compatibility & Notice] Compatible with 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 Contents: 1 x Filter Only. Other items not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.