What type of signal should duct smoke detectors report to a supervising station?

Duct smoke detectors play a crucial role in HVAC systems by detecting smoke within the ductwork and sounding an alarm when smoke is present. When a duct smoke detector activates, it primarily indicates a potential fire condition that requires a response. Reporting this condition as a supervisory signal is essential because it alerts the monitoring station to the need for inspection without necessarily triggering a full alarm evacuation, which may not be warranted if the situation can be managed.

Supervisory signals are typically used for conditions that require attention but do not demand immediate emergency action, allowing building managers or fire safety personnel to assess the situation and respond appropriately to the smoke detector's activation. This distinction is vital in ensuring a balanced approach to fire safety and response, minimizing unnecessary panic that might occur with a full fire alarm activation. Therefore, designating the signal specifically as supervisory enhances operational efficiency within the safety system.