[True H13 HEPA Filter]The filtration efficiency for 0.1 micrometre particles is as high as 99.97%, such as pollen, pet dander. [Unlike Other Activated Carbon Filters] It has the characteristics of developed pore structure, surface area, strong adsorption capacity and high strength. Easily remove household odors, such as smoke, chemicals, and volatile organic compounds(VOCs). [Superior Performance]Has noise control, workmanship, higher capacity and filter lifetime without sacrificing blue pure 411 purifier performance.The clean delivery rate(CADR) after replacement is no different from the filter. [Replacement recommendation]In order to maintain the performance of your blue pure 411 purifier, blue pure 411+ purifier or mini purifier, we recommend changing the filter 6 months or so when it is used 24 hours a day. [Matching & Attention]Suitable for blue pure 411 purifier, blue pure 411+ purifier and Mini purifiers.Attention: Please check your purifier when you buy it. Colour: white Material: filter paper + activated carbon cotton Package Contents: 1 * Component Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.