- The 115115 Winix value pack contains 1 HEPA filter and 4 carbon prefilters. This is a one year supply and fits Winix air purifier models P300, U300, 9500, 9000, 6300, 5500, 5300, 5000B and 5000. If using a Winix model that contains a complete original cartridge, just remove cartridge and replace with 1 HEPA filter and 1 Prefilter - the black prefilter will need to be on top facing the front. This value pack is made by Magnet by FiltersUSA.Magnet by FiltersUSA