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

Nonmetallic mechanical fasteners for dryer ducts must be listed to UL 181B. This standard specifically pertains to the requirements for ducting products, including those that utilize nonmetallic materials, ensuring they are safe for use in residential and commercial applications.

Choosing UL 181B is important as it covers the performance of nonmetallic duct connectors, transitions, and fittings for use with nonmetallic ducts. It ensures that the products meet rigorous fire and durability standards, which is essential for maintaining safety in dryer vent systems.

Standards such as UL 181A, UL 181C, and UL 181D pertain to different aspects of ducting and ventilation systems, but they do not specifically address nonmetallic mechanical fasteners in relation to dryer ducts. Therefore, UL 181B is the correct standard that ensures compliance for these specific components, making it crucial for installations to follow this guideline for safety and performance.