【Compatible Models】Package include 2 pack High Quality Blue Pure 511 replacement Filter with 2-in-1 Particle and Activated Carbon Filter Compatible with Blueair Blue Pure 511 Air Purifier. NOTE: FIT FOR BLUE PURE 511 ONLY, PLEASE MAKE SURE YOUR AIR PURIFIER MODEL!!! 【High Quality Material】 Blue Pure 511 replacements filter for Blueair Blue Pure 511 Air Purifier made of high-quality non-woven fabric and activated carbon, is durable and long-lasting, allowing the 511 filter to last longer and has a collapsible design, bring convenience and fresh air in your life. 【True HEPA Filter System】Our Blue Pure 511 Replacement Filter designed with 2-in-1 Filtra-tion System, HEPA filter works for 99. 97% air-borne particles down to 0.3 microns in size. Activated carbon Filter helps with household odors from pets, cooking, smoke, wildfire and more quickly and effectively. 【High Performance Filter】Easy to take off the older and dirty filter and replace NEW Blue Pure 511 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 4-6 months. 【Customer After-sales Service】Cost-effective 2 Pack Blue Pure 511 Replacement Filter. Your satisfaction is our greatest wish, if you have any questions, please contact us, we will provide you with efficient after-sales service. 2 Pack Blue Pure 511 Filter Replacement Compatible with Blueair Blue Pure 511 Air Purifier