Another common type of ductwork is sheet metal. This style is a rigid duct that is not flexible and is usually made of galvanized metal or aluminum. Both materials are durable and can resist mold growth. However, it may be harder to work with metal ductwork and it requires the exterior to be insulated with a fiberglass liner.
Aluminum alloy ductwork cost
$9-$20/pound
Galvanized steel ductwork cost
$4-7/pound
Aluminum and galvanized steel each has its own unique set of pros and cons. Aluminum is a basic metal and offers a hard, smooth surface. It’s lightweight and easy to shape. Galvanized steel is created through a process of dipping carbon steel into zinc. The end result is extremely durable and strong ductwork. Additionally, galvanized steel is rust- and corrosion-resistant.