Wolf Filter 1 True HEPA Filter + 4 Carbon Replacement Filters A 115115 Size 21 for Winix PlasmaWave Air purifier 5300 6300 5300-2 6300-2 P300 C535TRUE HEPA TECHNOLOGY: Removes up to 99. 97% of airborne pollutants as small as 0. 3 microns, such as dust, pet dander, smoke or odor, dust mite debris, mold spores and pollen. The air purifier is a pure solution to enhance your home environment, personal comfort and well being, especially in the springtime and allergy season. 3 STAGE FILTRATION SYSTEM: Pre filter, TRUE HEPA Filter, & Activated Carbon Filter, which remove airborne particles and odors