What triggers the closing of hold open doors during a fire alarm event?

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The closing of hold open doors during a fire alarm event is primarily triggered by the fire alarm system itself. When the fire alarm is activated, it indicates the presence of a potential fire hazard, prompting safety systems to react in a manner that minimizes the spread of smoke and fire throughout the building.

Hold open doors are typically installed in corridors or other egress areas to facilitate movement during normal conditions but must close automatically when a fire alarm is triggered. This action helps to maintain a safe environment by containing smoke and fire to a specified area, allowing occupants to evacuate safely and providing firefighters with better control over the fire situation.

The activation of fire sprinklers, the arrival of firefighters, and smoke detector increases may play roles in the overall fire safety strategy or response, but they do not directly trigger the mechanism holding the doors open. The primary control system in such scenarios is the fire alarm itself, which is specifically designed to communicate and activate necessary safety features like closing these doors in response to a detected fire condition.

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