Which material is commonly used in the construction of rigid ducting?

Sheet metal is commonly used in the construction of rigid ducting due to its durability, strength, and ability to handle a wide range of temperatures. It is particularly effective in commercial and industrial HVAC systems where high air pressure and flow rates are common. The rigidity of sheet metal allows it to maintain its shape and resist deformation under high pressure, making it a reliable choice for efficient airflow. Additionally, metal ducts can be easily fabricated into various shapes and sizes, allowing for design flexibility in system installations.

Other materials, such as plastic and fiberglass, may be used in specific applications, but they do not generally match the structural integrity and durability required for rigid ductwork in HVAC systems. Rubber is more commonly associated with flexible ducting and vibration isolation rather than as a material for rigid duct construction.