The compressed air discharged from an air compressor is hot, over 200*. Compressed air at these temperatures contains large quantities of water in vapor form. As the compressed air cools this water vapor condenses into a liquid form. As an example if an aftercooler is not used, a 200 scfm compressor operating at 100 psig introduces 45 gallons of water into the compressed air system each day.A moisture separator installed at the discharge of the aftercooler removes most of the liquid moisture and solids from the compressed air. Utilizing patented two-stage coalescing filters, moisture and solids collect at the bottom of the moisture separator and are manually drained to the outside.

Air cooled aftercoolers use ambient air to cool the hot compressed air. The compressed air enters the air cooled aftercooler. The compressed air travels through the aftercooler's finned aluminum tubes while ambient air is forced over the cooler by a motor-driven fan. The cooler, ambient air removes heat from the compressed air lowering the dewpoint.

For every 20°F (11.1°C) rise in compressed air temperature, the moisture content of the air doubles.

An oversized aftercooler will produce cooler air which will drop out more moisture and it will have a lower internal pressure drop which maintains the discharge pressure from the compressor to the work. For the the most efficient results, we suggest sizing the aftercooler for a 1 to 3 psi pressure drop.