YTCZ ultra-low noise axial flow fan is a new type of axial flow fan for universities, energy conservation, and ultra-low noise. Due to the use of wide blades and large chord length. The forward leaning and space twisting blade shape enables it to achieve the same air volume and pressure as traditional axial fans when driven at high speeds even at low speeds. At the same time, the new blade shape reduces the separation of airflow on the blade surface and the formation of airflow vortices, thereby reducing the secondary losses of airflow inside the fan. These comprehensive factors significantly reduce the endogenous aerodynamic noise inside the fan, reaching the national and industry standards for ultra-low noise fans. There are three installation methods: fixed, mobile, and pipeline.