What is UL 181A ductwork commonly referred to as?

UL 181A ductwork is commonly referred to as ductboard and is specifically designed for use in HVAC systems. It is a rigid type of duct that is typically made from fiberglass insulation that is bonded to a facing material, which allows it to provide excellent insulation properties as well as structural integrity. This type of ductwork is used in both residential and commercial applications due to its ability to minimize air leakage and improve energy efficiency.

Ductboard's surface is typically smooth, which helps to reduce friction losses in the airflow, thereby enhancing system performance. Being fire-retardant, ductboard also meets the necessary safety standards required in building codes. Recognizing UL 181A as ductboard is important because it emphasizes its specific uses, benefits, and compliance standards in mechanical installations, aligning with the regulations set forth for safe and effective HVAC design.