Which standard must nonmetallic fasteners comply with for duct installation?

Nonmetallic fasteners used in duct installation must comply with UL 181B. This standard is specifically designed to ensure the safety and performance of materials that are used in heating, ventilation, and air conditioning (HVAC) duct systems. UL 181B addresses the requirements for flexible air duct and flexible air connector products, focusing on aspects such as fire resistance, durability, and overall suitability for HVAC applications.

In the context of duct installation, it is crucial for fasteners to meet these safety and performance standards in order to prevent issues such as leakage, which can undermine system efficiency and indoor air quality. By adhering to UL 181B, manufacturers and installers help ensure that nonmetallic fasteners will perform effectively under expected conditions within the HVAC system.

Understanding the specific requirements of UL 181B is essential for anyone involved in duct installation, as it provides the guidelines necessary for creating secure and safe connections that will last throughout the lifespan of the duct system.