| 摘要 |
Fire extinguishing apparatus for ducting incorporating an extractor fan, comprising a fire extinguisher arranged to discharge extinguishing medium into the duct upstream of the extractor fan at a predetermined temperature and a temperature sensing unit operatively connected to a circuit selector control for cutting-out the fan when the unit detects a preset temperature less than the operating temperature of the extinguisher and including a by-pass circuit whereby the fan can be restarted following discharge of the extinguisher. A visual and/or audible indication of the state of the selector control circuit is provided to assist manual setting of the by-pass circuit when required. |
