About This Item
Air cycling through a 20x20 return can carry a steady stream of fine and coarse particles that gradually build up in your home. This 20x20x1 Allergen Defense filter in Filtrete’s 1000 MPR (MERV 11) tier uses electrostatically charged synthetic media with 3‑in‑1 technology to pull in and trap countless microparticles—such as pet dander, smoke, and smog—while also capturing larger particles like lint, household dust, pollen, mold spores, and dust‑mite debris.
