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One key component to an efficient walk-in cooler is its insulation. A standard walk-in cooler will have between 2 and 4 inches of Styrofoam insulation within its walls and a rubber sealing gasket around its door to help ensure that it is both airtight and well-insulated against the temperature of the air outside.
Thus, since an intercooler or aftercooler commonly cools charged air, they are both referred to as a Charge Air Coolers. What is a charge air cooler. A charge air cooler is used to cool engine air after it has passed through a turbocharger, but before it enters the engine.