After Cooler is installed at the end of compressor to chill the compressed gas. This heat-exchanger chills the air or gas discharged from compressor in industrial ASU plant or oil & gas plant, and removes moisture accordingly. Consequently, the efficiency of compressor can be improved and energy can be saved. These air or gas is compressed by cooler at last stage, and then to be cooled to its required temperature after passing through After Cooler. . The allowable pressure drop is very limited, and demister is installed inside to remove moistures. Also, for increasing efficiency of heat-exchanger, the Plate Fin type or High Fin type is applied to where air or gas is being taken or discharged. <Advantage of Continuous Plate Fin Type Heat Exchanger> (1) Compact & Cost Competitive Design (2) Vibration Free Design (3) Easy Bundle Removable & Maintenance Design <Advantage of High Fin Type> (1) Wide tube&Fin material combin