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Pipes and ductwork can experience excessive moisture, especially in homes with average humidity levels of 60 percent or higher. To prevent mold growth on plumbing and ductwork, reduce indoor humidity levels to between 30 and 50 percent by weatherizing your home, fixing leaks, and running a dehumidifier. You can also consider installing an ultraviolet lighting system that will destroy mold spores as air passes through the ducts.
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