In HVAC duct systems, what is a common material used for duct construction?

In HVAC duct systems, sheet metal is a commonly used material for duct construction due to its durability, strength, and efficiency in air distribution. Sheet metal ducts are typically made from galvanized steel or aluminum, which are resistant to corrosion and able to withstand varying internal pressures.

The use of sheet metal allows for smooth airflow, reducing resistance and noise during operation, which helps maintain energy efficiency within the HVAC system. Additionally, sheet metal can be easily formed into various shapes, allowing for precise designs tailored to specific building requirements.

Other materials, like fiberglass, wood, and plastic, have their applications and advantages, but they may not provide the same level of strength and efficiency for ductwork. Fiberglass can be used for insulation purposes, wood is not durable for ductwork, and plastic may not withstand high temperatures or pressures as effectively as sheet metal. Therefore, sheet metal is the preferred choice for its optimal functional characteristics in HVAC duct construction.