[Genuine H13 HEPA Filter] The filtration efficiency of 0.1 micron particles is as high as 99.97%, such as pollen, pet dander. [Unlike other activated carbon air filters] It has the characteristics of developed pore structure, large specific surface area, strong adsorption capacity and high strength. Easily remove household odors, such as smoke, chemicals and volatile organic compounds (VOCs). [Superior Performance] Features excellent sound control, workmanship, higher capacity and longer filter life without sacrificing blueair blue pure 411 air purifier performance. Clean air delivery rate (CADR) after replacement is no different from the filter. [Replacement Recommendation] To maintain the excellent performance of your blueair blue pure 411 air purifier, blueair blue pure 411+ air purifier or mini air purifier, we recommend that you replace the filter every 6 months or so when it is used 24 hours. one day. [Matching Model & attention] Suitable for blueair blue pure 411 air purifier, blueair blue pure 411+ air purifier and mini air purifier. Note: Check your air purifier when you buy it. Color: white Material: filter paper + activated carbon cotton Package contents: 1 * Component Only the above package contents, other products are not included. Note! Light photography and different displays may cause the color of the item in the picture a little different from the real thing. The permitted measurement error is +/- 1-3 cm.