This True Air Purifier Filter, compatible with Whirlpool WA – 2001FK and WA – 2002FK, combines a high – efficiency True HEPA layer and an activated carbon filter. The HEPA filter captures 99.97% of particles as small as 0.3 microns, like dust, pollen, and pet dander. The carbon part absorbs odors, smoke, and harmful gases. It’s easy to install and maintain, ensuring fresher air at home.