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See Chinese contents: GB/T 38979-2020 GB/T 38979-2020: Sanitary wares--Test method for flushing noise of toilet
This Standard specifies the facility conditions and measuring instruments, sample installation and commissioning, sound pressure level measurement, result calculation, uncertainty of measurement and test report for flushing noise detection of toilets (not including toilets and smart toilets that use pressure flushing devices).
