SDF series main tunnel-type axial-flow fan for subway ventilation, can also be used in railway tunnels, mountains and underground engineering and ventilation of the building, is a high pressure, low noise, high efficiency axial fans. At present there is no dedicated fan of the series, and underground construction boom and the situation of the large number of imports, the use of advanced CAD system software, multi-objective optimization design and domestic underground construction in General, subway tunnels, match the blade and machine, its technical indexes meet or part more than similar foreign products.