ICC Commercial Mechanical Practice Exam

Duct pressurization testing is a widely recognized method for assessing duct leakage in HVAC systems. This approach typically entails sealing all the outlets and inlets in the duct system and then pressurizing the ducts with a known airflow using a specialized fan. By monitoring the pressure and calculating the airflow needed to maintain that pressure, it can be determined if there are any leaks present in the ductwork.

This method is effective because it provides quantifiable data on the amount of air that escapes through leaks, which can then be compared to the system's design specifications. It allows professionals to identify problem areas that may not be readily observable through visual inspection or thermal imaging.

Understanding how duct leakage affects overall system efficiency and indoor air quality underscores the importance of testing in the commissioning and maintenance of HVAC systems. By ensuring ductwork is well-sealed, energy loss can be minimized, leading to lower operational costs and improved performance of the HVAC system.