Aftermarket Replacement Carbon Filter 3-Pack for Kuhl and Kuhl+ series - S chassis models (KWCFS) Carbon filter 3-pack for Khl SS, YS and ES models More filtration than standard foam and mesh filters Captures allergens such as dust, mold spores, pet dander, dust mites and pollen Filters Measure 17"x8.5"x.2" Made in the USA