Dehumidification is the process of removing moisture from the air. Once moisture has evaporated from the structure and contents, it must be removed from the air by exhausting to the outside or by use of dehumidifiers. Failure to properly dehumidify the air can result in substantial secondary damage and pose a health risk due to the likelihood of increased microbial growth.
Dehumidification may be accomplished by means of an open (AKA natural) system or using a closed (AKA mechanical) system. The open system uses outside air to replace humid air in the affected area. The closed system uses Low Grain Refrigerant (LGR) dehumidifiers or sometimes desiccant dehumidifiers. Combination systems are also used.