Leemone 2 Pack Blue Pure 211i Max Filter Replacement Compatible with Blueair Blue Pure 211i Max Air Purifier, H13 True HEPA & Activated Carbon Filter, Compare to Part #F2MAX B. 2 Pack 211i max filter. Not compatible with 211+ and 211+ Auto. This Blue Pure 211i Max Filter is designed exclusively for compatibility with the Blue Pure 211i Max Air Purifier. Please verify the model number before making your purchase,