Which distance dictates where fusible links or heat detectors can be located in relation to exhaust ducts?

The distance that dictates where fusible links or heat detectors can be located in relation to exhaust ducts is established by safety considerations regarding the effectiveness of the detection system. Locating these devices within 12 inches of the exhaust ducts allows them to effectively respond to the heat generated by potential fires in the ductwork. This proximity ensures that the fusible links or heat detectors can quickly react to an increase in temperature, thereby activating the dry chemical extinguishing system promptly.

The rationale for this specific distance is grounded in the need for timely detection in scenarios where combustion could occur, particularly within kitchen environments where cooking equipment and ventilation systems are present. Using an appropriate distance as defined in the NFPA 17 standard enhances the reliability of the fire suppression system, ensuring that it can minimize fire spread and mitigate damage effectively.