The price of variable pressure smoke exhaust pipe in kitchen is 280 yuan. The variable pressure smoke exhaust pipeline makes the flue of each floor into different cross-sectional forms, the lower flue is discharged through the primary and secondary flue, and the flue near the roof is used as a single flue to directly discharge the oil smoke into the flue. Its purpose is to change the cross-sectional form of flue as much as possible, make use of various physical laws of flue gas flow, keep the airflow moving upwards, and prevent flue gas from flowing backwards and crossing each other to the greatest extent.

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