LifeSupplyUSA 2PK Air Purifier Replacement Filter fits All Blueair 400 Series SmokeStop 400 Models 401, 410B, 403, 450E, 400PF, 401PF Fits ALL Blueair 400 Models 400PF, 401, 401PF, 410B, 402, 403, 410 450E, 455, 455EB Includes Activated Carbon layer Includes Activated Carbon layer High efficiency True HEPA Filter Prevent bacteria and mold growth and filters out gas and odor Brand New Individually Sealed - By LifeSupplyUSA