Fans play a crucial role in air management and safety assurance in the municipal transportation sector, deeply integrated into the modern operation systems of urban infrastructure such as subways, highway tunnels, and transportation hubs. In subway environmental control systems, high-power axial flow fans simulate the tunnel piston wind effect through intelligent variable frequency control. Their unique bidirectional jet design can precisely adjust the wind speed on platforms and in sections to a range of 2-5 m/s, and can switch to smoke exhaust mode within 90 seconds in case of emergencies. Urban highway tunnels are equipped with anti-corrosion jet fan clusters, featuring self-cleaning coated impellers to resist the erosion of vehicle exhaust. A distributed control system dynamically regulates CO concentration and visibility, ensuring pollutant levels remain below national secondary standards. The roof fan matrix in high-speed railway stations is designed for low noise, with an operating sound pressure level controlled below 65 decibels. Combined with heat recovery devices, it can reduce the energy consumption of central air conditioning by 30%. The anti-humidity and explosion-proof fan system deployed in urban underground utility tunnels uses multi-sensor fusion technology to monitor harmful gases such as methane and hydrogen sulfide in real time, automatically triggering graded ventilation strategies. Smart transportation hubs apply digital twin fan management platforms, optimizing the frequency of fresh air exchange based on big data on passenger flow, and 5G connectivity enables remote fault diagnosis. New energy vehicle charging stations are equipped with explosion-proof dehumidifying fans, maintaining air humidity below 40% RH in confined spaces. Their IP54 protection grade can withstand harsh outdoor weather. With the development of smart cities, the new generation of municipal transportation fans deeply integrates AI algorithms, automatically adjusting tunnel ventilation intensity based on traffic flow predictions. The application of magnetic levitation technology reduces the energy consumption of subway fans by another 15%. In the future construction of urban low-altitude transportation systems, fans will demonstrate greater value in aerodynamic control at vertical take-off and landing stations, providing key technical support for building a green and intelligent three-dimensional transportation network.