What temperature requirement must a four-hour fire-resistive assembly withstand during testing?

A four-hour fire-resistive assembly must withstand a temperature of 2,000°F during testing. This requirement is established to ensure that the materials and construction methods used in the assembly can effectively contain the fire for the specified duration while maintaining structural integrity and preventing the passage of fire and smoke. The level of heat resistance is crucial in protecting lives and property in the event of a fire, as it dictates how well the assembly can endure extreme temperatures before failing. Generally, the standards for these assemblies are set by organizations such as the Underwriters Laboratories (UL) and follow stringent tests to verify their performance under controlled fire conditions. This precise temperature ensures that a significant level of protection is provided in critical scenarios, underscoring the importance of adhering to these codes in construction and design.