A jet fan is usually installed to exhaust smoke when a fire occurs in a Japanese road tunnel. However, nothing was known about the exposure temperature when a fire happened around the jet fan. This research was undertaken to carry out fire experiments inside an actual tunnel to evaluate the temperature inside the tunnel by performing a numerical simulation. The results have revealed that under the hypothesized fire scale and fire conditions, if a specified distance is ensured from the fire, a jet fan’s intake temperature does not reach the danger level and it is possible to distribute the risk such as short-fall of ventilation capacity caused by breakdown of ventilator due to thermal exposure by installing jet fans in tandem. This paper reports on the knowledge gained from the experiment and the simulation.
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