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Galvanized steel and flexible fiberglass are commonly used materials for ductwork in HVAC systems. Galvanized steel is favored due to its durability, resistance to corrosion, and ability to withstand high pressures, making it ideal for duct systems that transport air in both residential and commercial buildings. It also possesses a relatively low cost compared to other materials.

Flexible fiberglass ducting, on the other hand, is lightweight and easy to install, allowing for versatility in design and application. It is typically used in tight spaces or where traditional rigid ducting may be cumbersome. The insulation properties of flexible fiberglass help to reduce energy loss and improve efficiency in heating and cooling systems.

Other materials listed, such as plastic or rubber, aluminum or wood, and copper or stainless steel, do not have the same level of usability or efficiency in standard ductwork applications. For instance, while aluminum can be used for ducts due to its lightweight nature and resistance to corrosion, it is not as prevalent as galvanized steel. Similarly, wood is generally not suitable for ductwork due to susceptibility to moisture and decay. Copper and stainless steel are materials often chosen for specific applications, such as refrigerant lines, but not commonly for ductwork itself.