1. The concept of ventilation and fume hood: The so-called ventilation is to discharge the dirty air in the room directly or after purification to the outside and replenish the fresh air, so as to maintain the indoor air condition, in order to adhere to the hygienic standards and meet the requirements of the production process. We refer to the former as exhaust air and the latter as supply air. The fume hood can be briefly understood as a box and a fan, and the gas generated in the box is discharged by the fan and safely discharged into the atmosphere.
2. Classification of ventilation: According to different power, the ventilation system can be divided into natural ventilation and mechanical ventilation, and mechanical ventilation can be divided into comprehensive ventilation and local ventilation. Comprehensive ventilation refers to a method of ventilation in the room as a whole. Local ventilation refers to ventilation methods that are controlled in places where hazardous substances are concentrated, or local areas where workers often move, such as fume hoods, universal smoke hoods, and atomic absorption hoods.
3. Laboratory ventilation: Laboratory ventilation is the skill to study the effects of the harmful substances in the laboratory on the air environment inside and outside the room.
Basic components of a laboratory ventilation system
1. Ventilation end equipment: It mainly includes fume hood, universal fume hood, atomic absorption hood, and blower type exhaust hood.
2. Ventilation pipeline system: There are mainly fans, ducts, dampers, mufflers, exhaust gas treatment towers, etc.
Precautions for use of fume hood
1. Before using the fume hood, check the power supply, water supply, drainage, gas and other switches and pipelines.
2. Open the lighting equipment and check whether the light source and the interior of the cabinet are normal.
3. Turn on the exhaust fan. Within about 3 minutes, the listening work is normal.
4. When the fume hood is inspected in the above order, if there is any problem, please suspend operation immediately and tell the maintenance unit to handle it.
5. Before the fume hood is turned off, the exhaust fan should continue to work for several minutes to completely remove the exhaust gas from the cabinet.
6. After using the fume hood, wipe the inside and outside of the cabinet clean, and close all switches and windows.
7. In the laboratory, ventilation is also required when the fume hood is not used, which is beneficial to the health of the laboratory personnel.
8. When the fume hood is in use, make up for 10 minutes every 2 hours (that is, open the window for ventilation). If the operation time exceeds 5 hours, open the window to prevent negative pressure in the room.
9. Prevent experiments in the fume hood when the fume hood is not opened.
10. Stop putting your head into the fume hood for operation or inspection during the experiment.
11. Stop storing or testing flammable and explosive items in the fume hood.
12. Prevent mobile plug strips or wires from being placed in a fume hood.
13. Stop the experiment in the fume hood to prevent the emission of organic substances mixed with high-chlorine compounds in China.
14. It is forbidden to put the tested substance in a fume hood experiment without safety. Once the chemical substance is sprayed out, the power should be cut off immediately.
15. When moving the upper and lower windows, operate slowly and gently to prevent the door handle from crushing your hands.
16. During the experiment, it is advisable to keep the window 100-150 mm from the table.
17. The operation area of the fume hood must be kept clear, and items should not be stacked around the fume hood.
18. When the operator does not use the fume hood, the ventilated countertop prevents excessive storage of experimental equipment or chemicals and prevents long-term stacking.
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