Photo 1 of 2 Pack 311i Max Replacement Filter Compatible with Blueair Blue Pure 311i Max Air Purifiers, HEPA and Activated Carbon Filter, Blue Pure F3MAX

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Photo 1 of 2 Pack 311i Max Replacement Filter Compatible with Blueair Blue Pure 311i Max Air Purifiers, HEPA and Activated Carbon Filter, Blue Pure F3MAXPhoto 2 of 2 Pack 311i Max Replacement Filter Compatible with Blueair Blue Pure 311i Max Air Purifiers, HEPA and Activated Carbon Filter, Blue Pure F3MAXPhoto 3 of 2 Pack 311i Max Replacement Filter Compatible with Blueair Blue Pure 311i Max Air Purifiers, HEPA and Activated Carbon Filter, Blue Pure F3MAX