The Sharp FZK50DFU is a replacement active carbon filter designed for a Sharp HEPA Air Purifier with Plasmacluster Ion Technology for Medium Rooms (FPK50UW). Keeping your home free of odors is simple with a Sharp air purifier with an active carbon filter. Carbon filters capture odors as well as large airborne particulates floating throughout the room. Your purifier is only as powerful and effective as the filter you put inside, and Sharp's replacement parts are essential for maintaining product performance. Each Sharp air purifier filter is designed specifically for a particular unit style. Not only will genuine replacement parts fit like a glove, but they also have the sleek and seamless design to match so that you can get the most out of your Sharp air purifier.