1, single flue type: a rectangular pipe, the pipe straight through each layer, leaving an inlet in the room to connect the hood line.

2, variable pressure type: in the installation, each layer of the flue is designed to be a different cross-section, and then the airflow of smoke upwards good.

3, non-return valve type: in the single pipe flue on the air inlet, with an enclosure with the non-return valve, so as to prevent the airflow retrograde.

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