Axial flow fan assembly and one-piece housing for axial flow fan assembly

An axial flow fan assembly including a housing, a stator, a motor supported by the stator, and a fan rotatably mounted on the motor. The stator is connected to the housing at an outlet end thereof, and includes a stator hub and a plurality of stator vanes each extending radially inwardly and axially downwardly from the housing. Each stator vane is connected at its inner tip to the stator hub. The motor is positioned within the housing and is supported by the stator hub. The fan is secured to the shaft of the motor, and includes a fan hub and a plurality of fan blades extending substantially radially outwardly from the fan hub. The particular configuration of the stator vanes allows the entire length of the motor casing to be encompassed between the inlet of the housing and the stator hub, which in turn provides a substantial reduction of the overall axial height of the fan assembly. The stator vanes also allow increased spacing between the fan blades and the stator vanes, which in turn reduces interaction between the fan blades and stator vanes. This reduces the level of noise generated by the fan.