180*85*235cm Laboratory all-steel fume hood laboratory bench exhaust hood fume hood chemical fume hood detox cabinet ventilation

1. When the operation window is fully closed, the upper part and the lower part are supplemented with air at the same time, and there will be no whistle and glass vibration caused by negative pressure.
2. When the operation window is opened to a safe height, the upper air supply port is closed, the working port is reasonable to supply air, and the gas is quickly discharged without backflow.
3. When the operation window is opened to the height of the top, it can meet the requirements of special experiments and is convenient for instrument handling, cleaning and maintenance in the cabinet