Premium PARTICLE and ACTIVATED CARBON filter Fits the Blue Pure 211+ Air Purifier by Blueair. FIT FOR BLUE PURE 211+ ONLY, PLEASE MAKE SURE YOUR AIR PURIFIER MODEL!!!</br></br> The HEPA replacement filter is designed to compatible with Blueair 211+ air purifier. Foldable Particle and Activated Carbon Filter, 360-degree air intake design, keep your home smelling fresh and odor free.</br> In order to improve the performance of the air purifier, please replace the carbon filter every 6~8 months.Simply remove the older and dirty filter and replace it. </br></br> 211+ replacement filter dimensions: 20.4” x 11.7” x 2.8"</br> Replacement Filter for Blueair Blue Pure 211+,the 211 plus replacement filter can ensure continued dependable performance of Blueair air purifier while maintaining the air clean for yr health and balance.</br></br> Disclaimer: </br> This is not an Blueair OEM product and is not covered under any Blueair OEM warranty. Any use of the Blueair brand name or model designation for this product is made solely for purpose of demonstrating compatibility.</br>