This document specifies the energy efficiency grades, energy efficiency limit values, and test methods for fans. This document applies to general-purpose centrifugal fans (including backward centrifugal fans, forward-curved centrifugal fans, radial centrifugal fans, volute-free centrifugal fans, and low characteristic speed centrifugal fans) with motor input power ranging from 0.125 kW to 500 kW, general-purpose axial fans and reversible axial fans, mixed-flow fans, fire smoke exhaust fans, and non-metallic material corrosion-resistant fans. This document applies to products that are produced in series or specially designed and manufactured, including fans with impellers mounted on the fan shaft, excluding driving devices, additional devices, or accessories, as well as fans with impellers mounted on or connected to electric motors, equiped with or without driving devices, casings, and variable speed drive devices. This document does not apply to ventilators, explosion-proof ventilators, box fans, roof ventilators, and air curtain machines used in motor vehicles, trains, and aircraft, as well as jet fans used for ventilation in parking lots and tunnels.