Duct Work Installed in the Sussex County home's Vented Crawlspace is subject to high humidity. Over time the outer liner will begin to degrade and the taped seams will come apart. The ductwork already has enough leaks when it was installed causing it to lose 30% of its air, the moisture from the crawlspace is just making the issues worse. With proper Crawlspace Encapsulation and dehumidification the duct work will be protected from this harsh environment.