Red Seal Sheet Metal Worker Practice Exam

What is the optimal type of ductwork for energy efficiency?

1. Flexible ductwork

2. PVC ductwork

3. Rigid ductwork

4. Fiberboard ductwork

The correct answer is: Rigid ductwork

Rigid ductwork is considered the optimal type for energy efficiency due to its ability to maintain shape and integrity under varying airflow conditions. Rigid ducts are manufactured from materials like sheet metal or fiberglass, providing a smooth internal surface that minimizes air friction, thereby reducing energy loss. This design allows for efficient airflow, which helps heating and cooling systems operate more effectively and consume less energy. In contrast, flexible ductwork can create more resistance and bends, potentially leading to air pressure drops and less efficient system performance. PVC ductwork, while useful in certain applications, is generally not suited for building HVAC systems where air needs to be distributed consistently and efficiently. Fiberboard ductwork, although it has some insulating properties, can be subject to moisture retention and is often less durable, leading to inefficiencies over time due to potential degradation. Thus, rigid ductwork stands out as the best option for maintaining high energy efficiency in HVAC systems.