?Compatibility?Blue Pure 211+ Filter Replacement With Cotton And Activated Carbon Filter Can Only Be Fits For Blueair Blue Pure 211 And 211+ Air Cleaner Purifier. And The Upgraded Universal Pp Cleaning Brush Is Suitable For Sweeper Air Cleaner Purifier And Vacuum Cleaner, With Its Unique Top Design Cut Off The Hair Or Thread Wrapped Around The Filter Element. | | ?2-Layer Filtration?The Genuine Hepa For Blueair Air Cleaner Purifier 211 Plus Replacement Filter With Activated Carbon Filter Stages Inside Remove 99.97% Of Dust, Pollen, Smoke, Odors, Formaldehyde Pm2.5, Pet Hair, And Vocs As Small As 0.3 Microns. | | ?Premium Quality? Compatible For Blueair 211 Filter / Blue Air 211 + Filter Replacement Is Made Of High Quality Activated Carbon And Cotton, Durable And Long-Lasting. | | ?Easy Installation?Our Collapsible 211+ Replacement Filter For Blueair Unfolds Into A Hollow Cuboid Shape, Remove The Older And Dirty Filter And Replace The New One In Just A Few Seconds. In O.