Which of the following is NOT a common component of fire sprinkler systems?

Fire sprinkler systems are designed to automatically extinguish or control fires through a network of pipes, fittings, sprinkler heads, and control valves. Pipes and fittings are essential as they carry the water from the source to the sprinkler heads. Sprinkler heads are the critical discharge points that release water onto the fire when the system is activated. Control valves are necessary for managing water flow and ensuring the system operates as intended.

Fire alarms, while important in fire safety for detecting smoke or heat and alerting occupants, are not components of a fire sprinkler system itself. Instead, they serve a different function, primarily related to alerting people to evacuate or take action before a fire becomes critical. This distinction helps clarify why fire alarms do not belong to the fundamental structure of sprinkler systems, making them the correct answer in this context.