Ducting tubes move air that has been heated, ventilated, and cooled (HVAC) systems all over a building. When things aren't built or installed correctly, the consequences can be costly and even dangerous to your health. Poor indoor air quality (IAQ) can happen if ducts leak. For example: The EPA and its Science Advisory Board (SAB) keep ranking indoor air pollution as one of the top five environmental threats to public health in comparison risk studies that they've done in the last few years. In addition to IAQ issues, improperly installed ducts can waste energy, wear out the HVAC system, and make people more uncomfortable in the building.