In the coastal town of Pensacola, Florida, the key to fighting humidity and excessive moisture is ensuring proper building ventilation. So when administrators at Pensacola Christian College decided to renovate Campus House, the college’s 3 - story dormitory, they knew they needed to get proper exhaust levels from the 30 risers leading from the buildings’ various bathrooms up to the attic. As it turned out, leaks in the ductwork were making it impossible for the large attic fans to draw sufficient air up through the system. After year - long efforts at manually sealing failed to do the trick, engineers considered adding auxiliary fans to each bathroom. Unfortunately, exorbitant labor costs, logistics and concern over excessive fan noise eliminated the viability of this approach as well.