Nonmetallic mechanical fasteners for ducts must be listed to which standard?

Nonmetallic mechanical fasteners used for ducts are required to be listed to the UL 181B standard. This standard specifically addresses nonmetallic duct systems, ensuring that materials and components meet safety and performance criteria suitable for HVAC applications. UL 181B focuses on the performance of these fasteners under conditions relevant to the mechanical systems in which they will be used, including factors like durability, resistance to certain conditions, and fire safety.

Choosing UL 181B ensures that the fasteners are certified for the specific applications associated with duct systems, giving professionals confidence that they are utilizing safe and reliable components in their installations. Understanding the relevance of UL 181B within the context of mechanical fasteners helps ensure compliance with local codes and promotes the integrity of duct systems.