What is UL 181A ductwork more commonly referred to as?

UL 181A ductwork is more commonly referred to as ductboard. This designation comes from its construction and characteristics; ductboard is a rigid insulation product typically made from fiberglass or other materials that are designed for heating, ventilation, and air conditioning (HVAC) systems. It is recognized under the Underwriters Laboratories (UL) standard for duct systems, providing safe and reliable performance.

Ductboard is known for its ease of installation, thermal efficiency, durability, and sound-dampening properties, which make it ideal for various HVAC applications. Its designation under UL 181A ensures that the ductwork meets specific criteria for smoke and flame spread, making it suitable for use in residential and commercial buildings.

The other options do not correctly describe UL 181A ductwork. Metal ducting refers specifically to duct systems made from metal materials, while flexible ducting comprises ductwork made from pliable materials that can be bent and installed in tight spaces. Insulated ducting is a broader term that could refer to any type of ductwork with insulation but does not specifically indicate ductboard, which is a rigid product. Thus, ductboard is the most accurate term associated with UL 181A ductwork.