What material is ductwork typically made of?

Ductwork is typically made of sheet metal for several crucial reasons. Sheet metal, often galvanized steel or aluminum, provides the necessary strength and durability to withstand air pressure and maintain structural integrity while distributing air throughout a building. Its resistance to corrosion and ability to handle thermal expansion make it suitable for varying indoor and outdoor environments. Furthermore, sheet metal ductwork can be fabricated into different shapes and sizes, allowing for efficient installation and design flexibility in HVAC systems.

While plastic options like PVC can be used for specific applications, particularly in low-pressure situations or where corrosion resistance is essential, they are not the standard material for ductwork. Wood is less common as it can warp, is less durable under high humidity or heat, and is not as effective in sealing joints compared to metal. Thus, sheet metal remains the most reliable choice for ductwork in HVAC systems.