The Triad AFD is a HEPA, High-Efficiency Particulate Air Filter. Adding the Triad AFD to the top of a Triad air mover will clean the air of allergens, bacteria, dander, dust, dust mite debris, mold spores, pollen, and other particles. The Triad AFD can also be used with an optional carbon filter*, (sold separately), to remove smoke and odors on the restoration jobsite.