What type of maintenance is typically performed on smoke and heat vents?

The correct response highlights the importance of ensuring smoke and heat vents are operational and free from obstructions. Functional testing is essential as it verifies that vents are working properly, which is critical for safety in case of fire. Regular cleaning is also necessary to prevent the accumulation of dirt or debris, which could compromise their effectiveness in an emergency.

In contrast, cosmetic enhancements do not contribute to the overall functionality or safety of the vents, while replacement of structural components may be required only when there are significant issues or failures present. Upgrading to digital systems pertains to modernization rather than routine maintenance practices for existing smoke and heat vents. Therefore, the focus on functional testing and cleaning is foundational for maintaining these safety systems.