What are the typical materials used for ductwork in residential systems?

The typical materials used for ductwork in residential HVAC systems include galvanized steel, aluminum, and insulated flexible ducting. Galvanized steel is widely used due to its durability and resistance to corrosion, making it suitable for many environments. Aluminum is lightweight and resistant to rust, while also providing good thermal efficiency. Insulated flexible ducting is favored for its versatility and ease of installation, allowing for longer runs without the need for as many joints, which can improve airflow and reduce leaks. These materials are commonly used because they effectively balance performance, cost, and longevity in residential heating and cooling systems.

In contrast, plastic, wood, and copper are not standard in ductwork. While plastic may be utilized in specific applications, it generally lacks the structural integrity and heat resistance required for the ductwork of residential HVAC systems. Wood is not typically used because it can warp and is not suitable for airflow. Although copper is an excellent conductor in certain HVAC components, it is impractical for ductwork due to cost and weight. Fiberboard and carbon fiber also do not represent common choices for residential ductwork. Fiberboard can be used for insulated ducts but is less prevalent compared to the materials in the correct answer. Rubber and vinyl do not provide the structural properties or