What is a key feature of a quick response sprinkler head?

A key feature of a quick response sprinkler head is its design that includes a fusible link with a fast response rate. This feature allows the sprinkler to activate rapidly in the presence of heat, typically responding to temperatures that are much lower than those required for standard sprinkler heads. Quick response sprinkler heads are specifically designed to activate at a lower temperature threshold, which can lead to quicker suppression of fires, minimizing damage and increasing the safety of occupants.

This responsive action is crucial during the early stages of a fire, as it helps control flames before they can spread, ultimately providing valuable time for evacuation and further firefighting efforts. The quick response capability is what differentiates these types of sprinklers from standard ones, which may take longer to activate.

The other options provided relate to features that do not accurately describe quick response sprinkler heads, such as temperature thresholds that are not representative of their operation, exclusivity to high-rise buildings, or requirements for manual activation, all of which are not characteristics of quick response systems.