Package Contains 3 Replacement Filters.
For optimal performance, replace the filter about once every six months when used 24 hours a day.
Please Ensure to Turn off Your Machine when Replacing the Filter.
Packing May Vary!!
This is not a Blueair OEM product. The brand names and logos are the registered trademarks of their respective owners. Any use of the brand name Blueair or model designation Blue Pure 311 for this product is made solely for purposes of demonstrating compatibility.