polystyrene panels (formerly known as Farr CF panels) were the first high-velocity straight through carbon purification filters available. Recommended for high gas/vapor load make... Cartridge Filter is designed to fit in place of existing 12" deep filters within an air-handler. Use of the Camsorb Pleated V-Cell Particulate + Carbon Cartridge Filter for dust... adsorbents based on activated alumina which may be used on their own or blended with activated carbon. Air Filters Inc. Website by Cattail ...