Fangrui Product Details Compatible: Great For The Blue Air 211, Hepa Filter Compatible For Blue Pure 211+ And Purifiers ;use A 360-degree Air Intake, Allowing The Air Filter 211 To Last Longer, And Has A Design. Premium Quality But Affordable Price: We Deliver High Quality, And Long-lasting Replacements, Allowing The Filter To Last Longer, And Has A Design. In Order To Improve The Performance Of The Air Purifier, Please The Carbon Filter Every 6-8 Months. Easy To Install: Simply Remove The Older And Dirty Filter And It. Please The Filter With Your Unit Is And Slides Into A Metal Cage To Install. Colour:white Material:activated Carbon Package Contents: 1 X 211 Filter Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.