In Van Air Systems AC series air-cooled aftercoolers, hot compressed air is introduced to the core as ambient air is drawn across it, leaving the exiting air cooler. AC series after-coolers are normally sized for a 15°F (or less) approach to ambient air. For example, a compressor discharges 250°F air and the aftercooler is located in 80°F ambient conditions. With a 15°F approach, the air exiting the aftercooler will be 95°F and saturated, and the moisture created by cooling from 250°F to 95°F will condense.