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The largest tunnel ventilation equipment in Japan is installed in an undersea tunnel about 10-km deep on Trans Tokyo Bay Expressway.
This is a ventilation plant for the Niigata Port Road tunnel in Kawaguchi, Shinanogawa, city of Niigawa, for which many measures were taken in consideration of the surrounding scenery and environment.
This is ventilation equipment for a road that passes underground under Hokkaido University (city of Sapporo). A dust collection device and a soundproofing device have been installed underground in consideration of the environment above ground.