Replacement Filter for Blueair 311i+ Max: Blue Pure F3MAX+ Filter Compatible with BLUEAIR Blue Pure 311i+ Max Air Purifier

COMPATIBILITY: Replacement Filter Compatible with BLUEAIR Blue Pure F3MAX+ 311i+ Max Air Purifier. 3-Stage Filtration High-efficiency: Included HEPA filter, Activated Carbon Filter and Pre-filter. STORAGE & USE: The filter should be stored in a dry place. Please remove the plastic packaging before placing the new filter into the air purifier. For best performance, we recommend to replace the filter once every 6-8 months. If you have questions or concerns, you can contact us and our customer service team will give you a satisfactory solution.