Which type of ducting is specified for dryer installations in residential settings?

In residential dryer installations, metal ducting is specified primarily for its durability and safety characteristics. Metal ducts, particularly those made from galvanized steel or aluminum, are designed to withstand high temperatures that are generated during the drying process and are less prone to catching fire compared to other materials.

Metal ducting is also smoother than plastic or flexible options, which reduces lint buildup and improves airflow efficiency. This is crucial for the operation of clothes dryers, as proper air circulation ensures efficient drying and minimizes the risk of overheating. Additionally, metal ducts are typically more rigid, providing a stable structure that is less likely to sag or become crushed, which can impede airflow.

While other materials such as flexible plastic or PVC may be convenient for certain applications, they do not meet the safety and performance requirements set forth by building codes for dryer venting. Therefore, choosing metal ducting is essential for compliance with the North Carolina Mechanical Code and for ensuring the safe operation of residential dryers.