Introduction to the safe use and matters of the fume hood in the laboratory

    In recent years, considering the improvement of the experimental environment, the experiments carried out on the test bench have gradually shifted to the fume hood, which requires the function of the most suitable equipment for use in the fume hood. In particular, most newly built laboratories require air conditioning, so the number of fume hoods to be used in the initial design phase of the building is included in the air conditioning system plan. Since the fume hood occupies a very important position in the biochemical laboratory, the number of fume hoods has increased dramatically in terms of improving the laboratory environment, improving the sanitary conditions, and improving work efficiency. The fume hood serves to ventilate and ventilate in the laboratory. In the experimental operation, various harmful gases, odors, moisture, and flammable, explosive, corrosive substances are generated. In order to protect the safety of users, the pollutants in the experiment are prevented from spreading to the laboratory, and a fume hood is used near the pollution source. In the past, the number of fume hoods used was small, and it was only used in experiments that were particularly harmful and dangerous, and that generated a lot of heat.

      The fume hoods are classified according to the exhaust mode: they are divided into the upper exhaust type, the lower exhaust type, and the upper and lower simultaneous exhaust type. In order to ensure uniform wind speed in the working area, the lower air exhaust type should be adopted for the ventilating cabinet of the cold process, and the upper exhaust type for the ventilating cabinet of the thermal process. For the process of unstable heat generation, the air vent can be installed on the upper and lower sides. The change in internal heat regulates the ratio of the upper and lower exhaust air to obtain a uniform wind speed.