Which is a necessary element for proper below grade installation?

For a proper below grade installation, adequate drainage is essential. This is crucial to prevent water accumulation around the foundation and other underground structures. Poor drainage can lead to water infiltration, which can cause various issues such as structural damage, mold growth, and corrosion of mechanical systems. By ensuring that an effective drainage system is in place, the risk of these problems can be significantly reduced, thereby maintaining the integrity and functionality of the installed systems.

The other aspects, while important in different contexts, do not directly address the unique challenges faced in below grade environments. Sufficient lighting may enhance visibility for maintenance and repairs, but it does not mitigate the risks associated with water presence. Passive cooling can be beneficial in specific scenarios, but it does not play a role in managing moisture levels or preventing water damage. Manual lifting may be useful for handling equipment or materials, but it is not a fundamental requirement for the installation process itself in below grade applications. Overall, adequate drainage is thus the critical element that must be prioritized for successful below grade installation.