LifeSupplyUSA 2 Air Purifier Filters fits ALL Blueair 400 Models 400PF, 401, 401PF, 410B, 402, 403, 410, 450E, 455, 455EB; By 2 True HEPA Filters Fits ALL Blueair 400 Models 400PF, 401, 401PF, 410B, 402, 403, 410 450E, 455, 455EB Dimensions: 4 x 10 x 21 inches Brand New Individually Sealed By LifeSupplyUSA