Snap on, easy to install and replace, no tools required. The pre-filter filters out dust, hair and pet fur.
Blue Pure 511 Replacement Filter for Blue air Pure 511 Air Purifier True HEPA &
XBWW 3 Packs Blue Pure 511 Replacement Filters for BLUEAIR Blue Pure 511 Air
Blue Pure 511 Replacement Air Filter Compatible with Blueair Blue Pure 511 AIR P
Blue Pure 511 Replacement Filter - True HEPA & Activated Carbon Filter
Blue Pure 511 Replacement HEPA Filter | Removes 99.97% of Pollen, Dust & Viruses
