Which material is most commonly used for ductwork?

Galvanized steel is the most commonly used material for ductwork due to its durability, resistance to corrosion, and ability to handle air pressure effectively. It has a long lifespan and can withstand the various environmental conditions and pressures encountered in HVAC systems. Additionally, galvanized steel can be easily fabricated into various shapes and sizes to fit different duct configurations, making it a versatile choice for both residential and commercial applications.

While materials like fiberglass and cardboard may be used in specific scenarios, such as for insulation or temporary ductwork, they do not generally meet the structural and long-term performance standards required for most duct systems. Copper, while excellent for plumbing and certain HVAC applications, is often more expensive and not as commonly used for ductwork compared to galvanized steel. The relying on galvanized steel ensures efficiency and reliability in the HVAC systems that depend on effective ductwork for air distribution.