LifeSupplyUSA True HEPA Plus 4 Carbon Replacement Filters for Winix 115115 Size 21 1 HEPA filter and 4 Carbon pre-filters included for odor reduction For Winix plasma wave air cleaner models WAC5300, WAC5500, WAC6300, 5000, 5000b, 5300, 5500, 6300 & 9000 Will fit the WAC9500 PlasmaWave Ultimate pet air cleaner if you first remove the complete original cartridge that came with the WAC9500. Insert the 115115 replacement filter where the cartridge was, with the black carbon filter on top facing the front Filter is absolutely essential for allergy sufferers designed to filter smoke, dust, pet dander, pollen, mold pores, fabric and other allergen air borne elements Brand New Individually Sealed - By LifeSupplyUSA