What mechanism must rolling shutters have for fire separation?

Rolling shutters designed for fire separation must have a mechanism that automatically releases the shutters in response to smoke detection. This is crucial for safety, as the primary function of fire shutters is to contain fire and smoke, preventing them from spreading to other areas of a building.

When smoke is detected, the automatic release mechanism ensures that the shutters close swiftly, protecting exit routes, reducing smoke inhalation risks, and minimizing damage. The integration of smoke detection with the operation of the shutters emphasizes the importance of an automatic response in emergency situations, allowing for a quick reaction that can save lives and property.

The other choices, while they may pertain to certain features of building safety systems, do not specifically target the urgent need for automatic operation in the event of a fire, distinguishing the correct choice as the most relevant in the context of fire separation mechanisms.