Where is the three-up six-down opening position on the exhaust pipe?

[MacLorenzo]

The three-up six-down opening position on the exhaust pipe is set at a distance of no less than 6 times the diameter downstream from components such as elbow reducers and valves, and no less than 3 times the diameter from the aforementioned components. Regulations for exhaust outlet setup: The exhaust outlet setup follows the principle of "facilitating sample collection, measurement monitoring, and daily on-site supervision and inspection." Exhaust pipes (chimneys) should be equipped with monitoring sampling holes, sampling platforms, and safety access. The sampling hole position should preferably be located in the vertical pipe section and the negative pressure zone of the flue. Automatic monitoring facilities required: Automatic monitoring is required for units listed in the key pollutant discharge unit catalog or automatic monitoring construction plan issued by the ecological environment department of the people's government at the municipal level or above, as specified in environmental impact assessments and approval documents, or where the discharge outlet specified in the pollutant discharge permit requires automatic monitoring.