CSLB Class B General Contractor's License Practice Exam

Which type of plumbing installation benefit from reduced conductive and radiative losses by being placed within conditioned space?

1. Piping

2. Ductwork

3. Drainage systems

4. Water supply systems

The correct answer is: Ductwork

The correct answer is that ductwork benefits from being placed within conditioned space to reduce conductive and radiative losses. When ductwork is insulated properly and located in areas that are heated or cooled, it minimizes the temperature differential between the air inside the ducts and the surrounding environment. This helps to maintain the temperature of the air being transported, improving system efficiency and comfort levels within the conditioned space. Ductwork operates by distributing air throughout a building, and if it's placed in unconditioned areas—such as attics or basements—it can lose heat in winter and gain heat in summer. This can cause the heating and cooling systems to work harder, resulting in increased energy costs and reduced system effectiveness. While other systems like piping, drainage systems, and water supply systems also have their operational characteristics, they do not experience the same level of conductive or radiative losses associated with air distribution that ductwork does. This makes ductwork placement in conditioned spaces particularly critical for maintaining energy efficiency and ensuring optimal performance of heating and cooling systems.