Atmospheric air is used to cool the compressed air in an Air Cooled After Cooler. SALIENT FEATURES OF SANPAR AFTER COOLER Highest Quality Copper tubes and Aluminium fins are used for effective heat transfer and durability. Low Pressure drop ( less than 0.1 bar). Low Noise ( less than 60 decibels). Low maintenance. Highly reliable fan assembly with protective guard. More than 10 standard models to choose from to meet individual requirement. Compact Models: occupies less floor space. Higher models on request.