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See Chinese contents: GB 37479-2019 GB 37479-2019: Minimum allowable values of energy efficiency and energy efficiency grades for ducted air conditioners
This Standard specifies the energy efficiency grades, technical requirements and test methods for ducted air conditioners. This Standard is applicable to ducted air-conditioning (heat pump) units and direct evaporation all fresh air handling units that use motor-driven compressors, and whose indoor unit static pressures are greater than 0 Pa (gauge pressure).
