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How can I obtain an engineering judgment from UL accepting a modification to an existing UL fire resistance rated design, system, or assembly?

April 26, 2017accepting Engineering existing judgment modification obtain rated resistance UL

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How can I obtain an engineering judgment from UL accepting a modification to an existing UL fire resistance rated design, system, or assembly?

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Any changes to existing designs, systems, and assemblies must be submitted to UL by the sponsor of the design. UL will conduct an engineering study at the request of the design sponsor only. Typically, the design sponsor is the manufacturer of one of the critical design components.