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Where can I find the fan noise disturbing the people in hot pot restaurant?
Ask the local environmental protection bureau to do a noise test on your living environment, or you can complain directly to the environmental protection bureau. You can also measure the noise of your own living environment in decibels:

According to Item 4.2. 1 of GB22337-2008 "Emission Standard for Community Noise", the daytime noise is less than or equal to 45 dB in Table 2 "Indoor Noise Emission Limits of Structural Transmission Fixed Equipment"; The noise at night is less than or equal to 35 decibels.