Aftermarket filter to fit Filter Queen Defender 4000 HEPA Filter Dimensions - 8 inches high, 7 and 1/2 inches inside diameter 11 and 1/4 inside diameter Included: 1 Filter Cartridge for the FilterQueen 4000 Defender Removes 99.97 % of particles as small as .3 micron High Quality Aftermarket part by GoodVac