It is therefore important tunnel ventilation for avoiding smoke and toxic or for reduction their distribution during the fire in tunnel. During processing and planning tunnel ventilation system its very important determination of ventilation system ability as for fire start as for developing its maximum power. In the previous work there is shown semi-transverse ventilation systems and transverse ventilation systems disadvantages which appears during the fire. Exactly in such situations motion direction of air and air consumption will be caused by fire and will not be depended on ventilators. As we. Determined the dynamic pressure launched by fire is at least 30 times more than most powerful ventilators which has been issued. Mentioned basic applies to also in such ventilation systems which contains two tunnels.
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