3C dual speed fire smoke exhaust fanThe main application scenarios are civil buildings, industrial and mining plants, basements, tunnels, air defense and other engineering projects. Tunnels may be relatively rare in plain areas, but there are still many tunnels in mountainous areas. Tunnels are designed based on highways and then drilled on mountains. The characteristic of tunnels is that they are long. Sometimes it takes more than ten minutes to drive through a tunnel, and it is very dark inside the tunnel. Therefore, it is required to turn on low beam lights when passing through the tunnel.

Tunnels belong to semi enclosed areas where vehicles come and go, and there is a lot of dust. In addition, the ventilation is relatively poor and the environment is not very good. In order to improve the ventilation and air exchange of tunnels, it is required to install and use high-temperature characteristics: good high-temperature resistance and high efficiency.