Providing Clarity on Fire Rated Ventilation Ducts and Assemblies

May 10, 2017

UL recently published an article titled “Ducts – Providing Clarity on Fire Rated Ventilation Ducts and Assemblies”.   The article provides much needed clarity to the use of Uninsulated “fire rated” duct systems residing in UL Category HNLN. https://www.linkedin.com/pulse/ul-sets-story-straight-misuse-uninsulated-fire-rated-duct-kerrison/