Fire sprinklers are designed to respond automatically when a fire produces enough heat to activate a sprinkler head. Each sprinkler head contains a heat-sensitive element, typically a glass bulb or fusible link, that holds water back inside the piping system.

When a fire starts, heat rises and collects near a fire sprinkler. If the temperature around the nearest sprinkler head reaches its rated activation point, that heat-sensitive element breaks or releases, allowing water to flow through the sprinkler head and disperse over the fire. Once activated, the sprinkler releases water directly over the fire area to help control or contain the flames before they can spread.

Fire sprinklers operate individually, not all at the same time. In most fire events, only the sprinkler head closest to the fire activates first because only that head has reached the necessary activation temperature. Other fire sprinklers remain closed unless the fire grows enough and the heat generated activates additional sprinklers. This keeps water discharge contained to the fire area where it is needed.

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