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See Chinese contents: GB 28381-2012 GB 28381-2012: Minimum allowable values of energy efficiency and evaluating values of energy conservation for centrifugal blower
This Standard specifies the minimum allowable values of energy efficiency, evaluating values of energy conservation, and test methods for centrifugal blowers. This Standard applies to single-stage dual-support low-speed centrifugal blowers; multi-stage low-speed centrifugal blowers; single-stage dual-support high-speed centrifugal blowers (including single-side impeller of dual-inlet blower); and multi-stage high-speed centrifugal blowers.
