The situation in the tunnel is complicated and the construction is started under the condition that many construction conditions are not allowed. For example, the circulation of air in the tunnel and the itch problem of the construction personnel must be installed after the tunnel construction. The tunnel jet fan produced by Boxing Motexo Industries Co., Ltd must be installed. To prevent valuable time in the evacuation of people in the tunnel, the tunnel fan can also be linked to the control box to open the smoke when the smoke concentration in the tunnel reaches a certain amount.
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