What material is commonly used for HVAC ductwork?

Sheet metal is commonly used for HVAC ductwork due to its strength, durability, and ability to withstand the pressures of air movement. It is capable of maintaining its shape under varying temperatures and pressures, which is essential for efficient airflow within heating, ventilation, and air conditioning systems. Additionally, sheet metal can be easily fabricated into various shapes and sizes, making it adaptable to different installation environments.

The use of sheet metal also aids in preventing air leaks, which can lead to energy loss and decreased system efficiency. Its non-combustible nature adds to the safety and longevity of HVAC installations. When coated or insulated, sheet metal can also help to minimize heat loss or gain, further promoting energy efficiency in a building's heating and cooling systems.

While other materials like wood, plastic, and cardboard may have specific applications in construction and packaging, they do not provide the same level of structural integrity and efficiency required in ductwork systems.