In buildings that use both duct detectors and a fire alarm system, which device must the fire alarm system monitor?

In buildings that use both duct detectors and a fire alarm system, which device must the fire alarm system monitor?

• A. Duct detectors
• B. Smoke detectors
• C. Heat detectors
• D. Gas detectors

Answer: (D)

The fire alarm system is the central point that annunciates and coordinates life-safety signals from sensors. Gas detectors are designed to indicate a hazardous condition that directly impacts occupant safety and often require immediate alarms and potential automatic safety actions (like shutting off a gas supply or triggering ventilation). Because of that critical role, if a building has both duct detectors and a fire alarm system, the gas detectors must be wired into and monitored by the fire alarm panel to ensure a single, clear alarm and coordinated response for occupants and responders. Duct detectors typically serve HVAC/interlock purposes and may not feed the fire alarm panel in every configuration, whereas gas detectors are expected to be integrated so their alarms are part of the building’s overall fire and life-safety signaling.

The fire alarm system is the central point that annunciates and coordinates life-safety signals from sensors. Gas detectors are designed to indicate a hazardous condition that directly impacts occupant safety and often require immediate alarms and potential automatic safety actions (like shutting off a gas supply or triggering ventilation). Because of that critical role, if a building has both duct detectors and a fire alarm system, the gas detectors must be wired into and monitored by the fire alarm panel to ensure a single, clear alarm and coordinated response for occupants and responders. Duct detectors typically serve HVAC/interlock purposes and may not feed the fire alarm panel in every configuration, whereas gas detectors are expected to be integrated so their alarms are part of the building’s overall fire and life-safety signaling.