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Drying can be accelerated and secondary damage can be prevented by keeping the air as dry as possible. This can be accomplished in one of two ways, an open drying system or a closed-drying system.
The open drying system is the process of using outdoor air to reduce the indoor humidity. Using this system, the structure is ventilated and not dehumidified. While this system can work in some instances, it has a downside.
The weather has to be consistently warm and dry. If the outdoor humidity rises, the drying process can actually be prolonged. The open drying system does not work well in areas such as basements or office buildings, where there isn't adequate ventilation available. Security is also an issue.
The closed drying system uses dehumidification in a closed indoor environment. Dehumidifiers are used to remove the water from the moisture-laden air. This system provides for a greater degree of control over the drying process. Indoor RH and material moisture content can be reduced faster, reducing the length of time that the equipment is required.
An open drying system may be appropriate in some situations, but dehumidifiers are easier to control. A closed drying system reduces the possibility of mould growth, and secondary damage to structural materials and contents resulting in reduced reconstruction costs.
