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See Chinese contents: GB 28378-2019 GB 28378-2019: Minimum allowable values of water efficiency and water efficiency grades for showers
This Standard specifies the water efficiency grade, technical requirements and test methods of showers. This Standard is applicable to the water efficiency evaluation for the showers (including sprinkler or sprinkler combinations) that is used in the shower room and other sanitary facilities, and that is installed at the end of the cold and hot water supply pipelines in the building, with a nominal pressure (static pressure) no greater than 1.0MPa.
