1.Blue Pure 211and Replacement Filter: Compatible with Blueair Blue Pure 211and Air Purifier Cleaner, Fit for Blue Pure 211and Only. (Warm Tip: (Search 'B073WJL99W'and 'B08LQQKD8B' for Blue Pure 211and Air Purifier, Please check the purifier model before making an order. ) 2.Activated Carbon Filters: Active carbon filters absorb pets, cook, and home smell. The 211and real HEPA filter can capture 99.97 percent of the air particles, as low as 0.3 microns. 3.Blue Pure 211and Filter Layers: Double layer filtration, front filter absorbs pet plush and life debris. Carbon filter captures volatile organic compounds, smoke components. 4.Easy to Install: No additional tools are required to release the hand from the complex replacement steps. 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.