Genuine Winix brand replacement for the Winix 5500-2 air Purifier | | Includes a 99. 97Percent efficient true HEPA, capturing particles to 0. 3microns | | With an advanced odor control aoc Carbon filter for blocking VOCs, fumes and odors | | Winix original filter providing correct airflow | | Filters last ONE YEAR! Change filters when check filter indicator turns on. | |