A perfect replacement filter fit for Blueair Blue Pure 211+ and Max Air Purifier, which can help the air purifier work more properly and effectively. </br></br> Perfect fit for Blueair Blue Pure 211+ and Max Air Purifier</br> Regular replacements make long-lasting air purifiers.</br></br> Please Double Check Your Air Purifier Models before purchasing!</br></br> Note: This is not a Blueair OEM product. Teh Blueair brand names and logos are the registered trademarks of their respective owners. Any using the Blueair brand name or model designation for this product is made solely for purposes of demonstrating compatibility.