Perfectly Fits -- replacement filter for blue pure 411, 411+, 411 auto and mini air purifier. 411 replacement filter are carefully measured, match as orginal.Eliminate Odors Efficiently -- this 411 replacement filter has two-stage filtration system with high quality activated carbon filter. The activated charcoal layer with millions of micropores can efficiently removes annoying household odors,chemicals, gases, smog and volatile organic compounds. After using this filter, you can fully enjoy an odorless room.H13 Grade Hepa Filter Capture to 99.97% Particles -- Particle filter is made from high quality H13 Grade filtration materials with HEPA filtration technology. This true HEPA filter can reduces 99.97% of particles as small as 0.1 microns such as dust, hairs, pet dander, food crumb,fibers, .It will makes your blue pure air purifier work great. More importantly, you can breathe fresh air freely in your room.Easy to Replace -- It's very easy to replace filter for Blue Pure 411, 411+, 411 Auto with convenient rope.We recommend replacing your filter about every 6 months when used 24 hours a day.Material: filter papercolour: WhitePackage Contents:1 x filter elementsOnly 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.