16x28x6 Aprilaire Space-Gard 2400 Replacement Air Filter Part 401 MERV 13 Plus Carbon 1 PackNordic Pure 16x28x6 Aprilaire Space Gard 2400 Replacement Air Filters Part 401 MERV 13 Plus Carbon are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home. It will help eliminate unwanted odors as well as trap most airborne dust and particulate matter for fresh, clean air. Odorous gases and vapors (VOC) are attracted to and held