The Blue Pure 121 Particle and Activated Carbon Replacement Filter protects against both gaseous and particulate contaminates. An activated carbon mesh layer eliminates harmful gaseous pollutants such as volatile organic compounds (VOCs), tobacco smoke, and other odors. In addition, advanced polypropylene filter media removes particle pollutants down to 0.1 micron in size from your indoor air, such as pollen, dust, and pet dander. Using a 360-degree air intake and up to 4 times the filter surface area than competing replacement filters, the Blue Pure 121 Particle and Activated Carbon Filter lasts longer, on average from 6 months to a year. Subscribe & save up to 10% on auto-delivered filters when replacement is needed; We recommend replacing your filter about every 6 months depending on usage. NO COMPARISON – 4X FILTER SURFACE AREA & 360 AIR INTAKE: Blueair models with HEPASilent's mechanical and electrostatic filtration produced higher CADR, lower noise, and had lower energy consumption vs. the same models with only mechanical filtration (H13 filter).

• 【PERFECT COMPATIBILITY】High Quality 121 Filter with Parti-cle and Activated Carbon Replacement Filter Compatible with Blueair Blue Pure 121 Air Purifier. 
• 【PREMIUM QUALITY FILTER】 Our 121 replacements filter for Blueair Blue Pure 121 Air Purifier made of high-quality non-woven fabric and activated carbon, is durable and long-lasting, allowing the 121 filter to last longer and has a collapsible design, bring convenience and fresh air in your life.
• 【2-IN-1 FILTRA-TION SYSTEM】Blue Pure 121 Replacement Filter designed with 2 stage Filtra-tion System, HEPA filter works for 99. 97% down to 0.1 microns in size like pollen,dust, pet dander. New activated carbon distribution technology can attach household odors, smells, odors, gases and VOCs more quickly and effectively.
• 【EASY TO REPLACE & INSTALL】Simply take out the older and dirty filter and replace NEW Blue Pure 121 Replacement Filter. Please ensure the filter with your unit is collapsible and slides into a metal cage to install. In order to improve the performance of the air purifier, please replace the filter every 6 months.