Frost King's air filter is made from open-cell, polyurethane foam. It helps keep dust and pollen out of your home. With plain scissors, you can easily cut it to any size to fit your AC window unit. This easy-to-install filter is washable and reusable for lasting use. With a size of 24 inches by 15 inches and a thickness of 3/16 inches, this filter is compatible with most standard air conditioning units and is easy to install. Keep your indoor air quality at its best with the Frost King air filter.