Seven points to pay attention to the correct selection of fume hoods
In the modern research laboratory, complete scientific instruments, perfect experimental equipment, and good experimental environment are the necessary conditions to improve the level of science and technology and promote scientific research results. People-oriented, ensuring safety and improving efficiency are the mission of laboratory construction. As an important experimental facility in biochemical laboratory, fume hoods play an important role, so it is necessary to carefully select fume hoods that meet various technical indicators. If the hoods installed by the unit purely and unilaterally reduce the cost of the hazards, the consequences are unimaginable. People should pay enough attention to them. Then how to choose the hoods?
In the laboratory construction, when determining the installation position of the fume hood, the installation position should be considered to avoid facing the road and the site where personnel pass frequently, to avoid blocking the window and the place where ventilation and lighting are unfavorable, to avoid blocking the switch that affects the entrance and exit door, and to avoid being placed against and placed at the corner wall. And for the choice of fume hood, it is necessary to choose the type, material, shape, etc. of fume hood according to the experimental content, which is usually considered. The following:
1, the use of drugs: when using organic matter or other special reagents to experiment, to fully consider its control of wind speed. Heat source: When using a device with a heat source, when its heat exceeds 2000 kcal/hour, the amount of ventilation required to discharge heat should be considered to determine the power of the fan.
2, there are radioactive substances or perchloric acid and other experiments: to choose a special fume hood, the air inlet speed must be set greater than 0.5m/s.
3, when using large equipment for experiments: to consider the effective size of the interior, to leave the necessary space for exhaust.
4, material: When using special acid experiments, it is necessary to consider the material of the fume hood, such as the semiconductor industry, corrosion industry, etc., which needs to be manufactured with anti-corrosion materials.
5, size: according to the content of the experiment to choose its size, the volume is too large to cause wave waste, too small affect the use.
6, environmental protection: If the harmful gas discharged must be ensured to be lower than the national environmental protection requirements if it exceeds the national health standards, the corresponding purification device should be installed.
7, energy saving: try to consider saving energy, in the room with heating or air conditioning should be used to supplement the air fume hood or choose a fume hood with air volume control. When selecting the fan, it is also necessary to determine its power according to needs, and it is not appropriate to blindly increase the exhaust air volume and pressure, and the power consumption can be reduced by frequency converter or variable wind speed fan.
