NATE Air Distribution Practice Test

The classification of duct types in air distribution systems is primarily based on their materials and configurations, with flexible ducts, sheet metal ducts, and insulated ducts representing the most recognized and utilized types.

Flexible ducts are designed to be adaptable and easy to install in spaces where rigid ducts might not fit easily. They are typically made of a flexible plastic material and are often insulated to minimize energy loss.

Sheet metal ducts, commonly made from galvanized steel or aluminum, provide a durable and rigid structure for air distribution. These ducts are efficient in minimizing air leakage and can handle higher airflow rates compared to other types.

Insulated ducts are essential in preventing energy loss due to temperature differences between the conditioned air within the duct and the surrounding environment. This type of ducting is designed to maintain energy efficiency and enhance indoor comfort by minimizing heat transfer.

Other choices like plastic ducts, concrete ducts, and wood ducts are less common or not typically classified as primary types of ducts in standard air distribution practices. While plastic ducts can be found in specific applications, they do not serve as a main category. Concrete ducts are rare and typically used in specialized construction, while wood ducts do not meet the requirements for efficiency and safety needed in modern HVAC systems.