Fire Detection and Warning Systems, Devices, and Methods for Kitchen Ventilation

A method of identifying a fire risk condition, comprising:

• providing a kitchen exhaust hood with a plenum and an exhaust duct connected to the plenum, the kitchen exhaust hood having a fire suppression system with fusible links installed;
• positioning at least one temperature sensor inside the plenum;
• providing a control module operatively connected to the at least one temperature sensor;
• receiving at the control module a signal representing temperature inside the plenum from the at least one temperature sensor;
• comparing the temperature inside the plenum with a temperature representing a melting temperature of the fusible links;
• and
• outputting a warning signal from the control module in response to a result of the comparing.

A method of verifying operation of a fire suppression system, comprising:

• providing a fire suppression system configured to discharge a fire suppressant in response to a detection of a fire, wherein the fire suppression system includes one or more fire detectors;
• monitoring the one or more fire detectors with one or more temperature sensors and outputting signals from the one or more temperature sensors to a controller;
• and
• generating a fire warning signal by the controller in response to a temperature measured by the temperature sensors exceeding a threshold temperature Tset for a duration Tdur.