The IICRC WRT body of knowledge explains that when outdoor air has alower humidity ratiothan indoor air, ventilation can be used to reduce the indoor humidity ratio by replacing moist air with drier outside air. This reduction directly supports evaporation and drying.
Ventilation works by exchanging air masses. If the incoming air contains less moisture per pound of dry air, the overall moisture content of the drying chamber decreases. The WRT manual stresses that psychrometric comparison—not temperature or relative humidity alone—must be used to determine whether outdoor air is suitable.
Ventilation does not directly reduce microbial growth; rather, it reduces moisture conditions that support microbial amplification. Static electricity and sublimation are unrelated to ventilation drying.
Properly applied ventilation is recognized by the WRT standard as a legitimate moisture removal method when conditions allow, though it must be monitored to ensure effectiveness and prevent unintended moisture introduction.
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