Replacement Filter for Blueair Blue Pure 411/411+ & 3210 Air Purifier True H13 HEPA Filter with Activated Carbon Captures 99.97% of particles as small as 0.1 micrometers, including pollen and pet dander Advanced pore structure with large specific surface area for strong adsorption capacity and high durability Effectively reduces household odors from smoke, chemicals, and volatile organic compounds (VOCs) Designed for superior performance, excellent noise control, fine craftsmanship, and extended filter life Maintains clean air delivery rate (CADR) comparable to the original filter Recommended replacement every 6 months with continuous use for optimal performance Compatible with Blueair Blue Pure 411, Blue Pure 411+, and Mini air purifiers Verify your air purifier model before purchase Color: White Material: Filter paper + activated carbon Package includes: 1 x Replacement filter (filter only; other items not included) Note: Lighting and display differences may cause slight color variations Measurement tolerance: +/- 1-3 cm