In the beginning of 2014, UL 10D became the new minimum for testing fire curtain assemblies. These updated standards cover the assessment of protective fire curtain assemblies that provide supplementary, passive fire protection.
This new testing standard measures performance ratings based on fire exposure to the curtain assemblies. UL 10D aims to determine the suitability of certain fire curtains for use in structures where building codes require fire protection for particular durations.
Unfortunately, a testing environment cannot always accurately represent all possible emergency conditions. In reality, fire conditions can be radically different based on ventilation, structure size, fire protection configuration and other variables. However, UL 10D does use average fire exposure to achieve specified temperatures over a certain time period.