The Skuttle USK448-4O is the correct replacement air cleaner filter for the following systems:
The Skuttle USK448-4O Air Cleaner Filter can be used on air cleaner systems requiring 20"x16"x5" media filter cartridges. The Skuttle 448-4 is an efficient air filter cartridge that drastically removes airborne particulates such as pollen, mold spores, dust, pet dander, dust mites and other allergens from your indoor air.
Skuttle 448-4 Air Cleaner Filter Specifications:
It is recommended that you replace Skuttle air filter cartridges every 3-6 months for optimum results and efficiency.