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See Chinese contents: GB 19761-2020 GB 19761-2020: Minimum allowable values of energy efficiency and energy efficiency grades for fan
This Standard specifies the energy efficiency grade, minimum allowable values of energy efficiency, test methods and technical requirements of the fan. This Standard is applicable to general-purpose centrifugal fans, general-purpose axial flow fans, centrifugal induced draft fans for industrial boilers, centrifugal fans for boiler of power station, axial flow fans for power station, centrifugal fans for HVAC, and forward multi-blade centrifugal Fan.
