How does a fire sprinkler system work?

Each sprinkler head is held closed by a small piece of heat-sensitive material. This piece acts as a plug to prevent water from flowing at normal temperatures. When heated by a fire, the sprinkler heads near the fire are activated and release water to put out the fire. To keep the pressure steady and avoid overwhelming local water suppliers, the entire system is powered by a fire pump, which pumps water at large volumes from a separate water source.

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