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Condensation on ductwork, wet walls, and a hygrometer that climbs after lights-out are not minor grow room issues. They are signs that the room is producing more moisture than its ventilation and drying equipment can remove. Knowing how to reduce grow room humidity starts with treating moisture as an engineering load, not simply turning up a fan. For cannabis, hemp, flowers, and other specialty crops, high relative humidity can slow transpiration, trigger condensation, and create favor …