The heat dissipation performance of a fiber optic splice closure will depend on a variety of factors such as the design and materials used in the closure, the environment it is installed in, and the amount of heat generated by the splices inside the closure.

Generally, fiber optic splice closures are designed to dissipate heat efficiently in order to maintain the proper operating temperature of the splices inside. This is important because excessive heat can degrade the performance of the fiber optic cables and lead to signal loss or failure.

To improve heat dissipation, fiber optic splice closures may incorporate various features such as ventilation holes, heat sinks, or cooling fans. Additionally, some closures may be designed with materials that have high thermal conductivity, such as aluminum or copper, to facilitate the transfer of heat away from the splices.

In general, the heat dissipation performance of a fiber optic splice closure will depend on the specific design and installation conditions, as well as the overall quality of the closure itself. It's important to choose a high-quality closure that is designed to withstand the environmental conditions and provide reliable performance over time.