Use ventilation and other methods to create the required air environment for the tunnel and underground construction projects. Different tunnels and underground works have their ventilation requirements. Due to the geographical and climatic conditions, building structure, and internal production processes, the ventilation technology measures should be different (see the development and utilization of underground space).

We've been working with China Railway 9th/10th Bureau, China Railway Tunnel Bureau, Beijing Municipal, and other government organizations for many years since established. Tunnel project such as Longdongbao Airport Ssangyong Interchange, Hailongtun Tunnel, Pagoda tunnel, Wangcheng Avenue under the tunnel,.etc

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