RGF’s REME HALO® In-Duct Air Purifier is an optional add-on we offer with our Trane and Goodman Systems. It purifies air in your entire home/building and kills almost 99% of germs, bacteria & mold. More Info: https://greenleafair.com/product/rgf-reme-halo-whole-home-in-duct-air-purifier/