Final answer:
Fire alarm systems are interconnected with the Building Management System (BMS) or HVAC controls to halt air movement in the event of a fire, a measure which aids in preventing the spread of smoke and fire, and supports safe evacuation and firefighting efforts.
Step-by-step explanation:
It is imperative that air movement be shut down immediately in the event of a fire situation. Fire alarm systems are therefore interfaced to the Building Management System (BMS) or Heating, Ventilation, and Air Conditioning (HVAC) controls, so that an alarm signal will cause the air handling systems in the area of the alarm to shut down. This integration is critical for preventing the spread of smoke and fire, ensuring that ventilation systems do not work against the efforts of firefighters and evacuation procedures.
Modern fire alarm systems are designed to communicate with these control systems directly or through a central building management system. When a fire alarm is triggered, the system sends a signal to the BMS or HVAC controls to halt air circulation in the affected zone, while allowing it to continue in areas not at risk, to facilitate safe evacuation and fire containment.