What is one requirement for pressure relief device installation related to environmental factors?

The correct response highlights that the temperature at which the pressure relief device is installed must be representative of the fuel supply container. This is crucial because the pressure relief device's function is to prevent excessive pressure buildup within the container. If the pressure relief device is not set to respond accurately to the temperature of the gas inside the container, it may not operate as intended in an emergency, potentially leading to dangerous situations such as over-pressurization.

Maintaining a temperature representative of the fuel supply ensures that the pressure relief device activates at the correct pressure levels that correspond to the gas's behavior under varying temperature conditions. This not only enhances safety but also complies with industry regulations that dictate proper installation practices for pressure relief systems.

Each of the other options presents valid environmental considerations, but they do not directly address the specific requirement for pressure relief device installation in relation to temperature. For example, while protection from freezing temperatures is important for the functionality of many devices, it is not the primary factor in determining how the pressure relief device should be calibrated relative to the gas container. Likewise, exposure to direct sunlight and isolation from other gases can be important for overall safety, but they do not specifically pertain to the operational response of the pressure relief device in relation to temperature.