True H13 HEPA FilterThe filtration efficiency for 0.1 micrometre 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, specific surface area, strong adsorption capacity and high strength. remove household odors, such as smoke, chemicals, and volatile compoundsVOCs.Superior PerformanceHas noise control, workmanship, higher capacity and filter lifetime without sacrificing blue pure 411 air purifier performance.The delivery rateCADR after replacement is no different from the filter.Replacement recommendationIn order to maintain the performance of your blue pure 411 air purifier, blue pure 411+ air purifier or mini air purifier, we recommend changing the filter 6 months or so when it is used 24 hours a day.Matching model& AttentionSuitable for blue pure 411 air purifier, blue pure 411+ air purifier and Mini .Attention: check your air purifier when you buy it.Colour: whiteMaterial: filter paper + activated carbon cottonPackage Contents:1 * ComponentOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.