[True H13 HEPA Filter]The filtration efficiency for 0.1 micrometre particles is as high as 99.97 percent , 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]Has excellent noise control, workmanship, higher capacity and longer filter lifetime without sacrificing blue pure 411 air purifier performance.The clean air delivery rate(CADR) after replacement is no different from the filter. [Replacement recommendation]In order to maintain the excellent performance of your blue pure 411 air purifier, blue pure 411and air purifier or mini air purifier, we recommend changing the filter every 6 months or so when it is used 24 hours a day. [Matching modeland Attention]Suitable for blue pure 411 air purifier, blue pure 411and air purifier and Mini air purifiers.Attention: Please check your air purifier when you buy it. Colour: white Material: filter paper and activated carbon cotton Package Contents: 1 x Component Only 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. for Blue Pure 411 Air Purifiers Filters 411and and MINI Air Purifiers Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.