Photo 1 of 511 A11ergenBlock Replacement Filter Compatible with Blueair Blue Pure 511 Air Purifier, 2-in-1 511 HEPA Filter with Activated Carbon for Pet Fur, Dander & Odor, Blue(2 Pack)

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Photo 1 of 511 A11ergenBlock Replacement Filter Compatible with Blueair Blue Pure 511 Air Purifier, 2-in-1 511 HEPA Filter with Activated Carbon for Pet Fur, Dander & Odor, Blue(2 Pack)Photo 2 of 511 A11ergenBlock Replacement Filter Compatible with Blueair Blue Pure 511 Air Purifier, 2-in-1 511 HEPA Filter with Activated Carbon for Pet Fur, Dander & Odor, Blue(2 Pack)