Dehumidification is the removal of water from the air. Dehumidification equipment treats the ambient air before the air is introduced to the enclosure. A closed loop system, as shown in Figure 1, is one that theoretically routes all the air exiting an enclosure through the appropriate filter media and treatment equipment and then returns it to the enclosure. By establishing a closed loop system, the "treated" air is continuously processed which improves the efficiency of this operation. The generic types of dehumidification equipment and their application in a closed loop system will be presented.

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