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  Increasing tunnels fire safety due to use of jet fans and portal gates

  The characteristic of railway and road tunnels of Russia is given. Data of the field observation characterizing natural ventilation of tunnels due to natural draft are provided. Requirements to emergency ventilation at fire emergence are stated. Results of theoretical and experimental inves-tigation on ensuring necessary parameters of emergency ventilation when using jet fans and portal gates are given. Examples of the emergency ventilation performance on Gimrinsky and Baikalsky tunnels are considered.

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