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The primary function of a fire alarm system is to detect smoke or fire and alert occupants and fire services. This crucial role is achieved through various components of the system, including smoke detectors, heat detectors, and manual pull stations. When these devices sense the presence of smoke or heat, the fire alarm system generates an audible and/or visual alert, thereby warning building occupants to evacuate and notifying emergency services that assistance is needed.

Timely detection and notification are vital, as they significantly increase the chances of safe evacuation and effective emergency response, ultimately reducing injury and damage in the event of a fire. While other functions, such as activating sprinkler systems or providing visual alerts for the hearing-impaired, are valuable and can enhance overall safety, the core purpose of a fire alarm system lies in its ability to detect danger and prompt immediate action.