Providing Clarity on Fire Rated Ventilation Ducts and Assemblies

May 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://lnkd.in/e8qDCrv