The FKZ main fan can be manufactured in either right-rotating or left-rotating models. The rotation direction of the impeller is viewed from the drive end. If the impeller rotates clockwise, it is called a right-rotating fan (or clockwise rotating fan), indicated by "right"; if the impeller rotates counterclockwise, it is called a left-rotating fan (or counterclockwise rotating fan), indicated by "left."

The FKZ main fan is a successful design based on the original mine-saving energy fan, achieved through technical improvements, structure refinement, enhanced performance, and expanded machine sizes. This series features higher operating efficiency, lower noise, a wider performance range, and more significant energy-saving effects. Additionally, a flow stabilizing ring device is installed inside the main duct, with a characteristic curve free of humps, ensuring stable operation of the fan under any resistance condition.

The FKZ main fan features a stabilizing flow ring anti-surge device within the main air duct, with a characteristic curve free of humps, ensuring stable operation of multiple fans working together under any resistance condition. As a main fan, it requires minimal civil engineering work, saving substantial investment. It is suitable for installation underground and serves as a fan station in a multi-stage ventilation system for power stations.