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GB/T 34877.4-2024_Chinese: Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 4: Sound intensity method (Chinese: 工业风机 标准实验室条件下风机声功率级的测定 第4部分：声强法) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 34877.4-2024
