The installation of ventilation ducts in school chemistry laboratories is very necessary and beneficial, with the following advantages:

1. Protect the health of teachers and students: various harmful gases, vapors and dust may be produced during chemical experiments. Effective ventilation can discharge these harmful substances in time, reduce the risk of teachers and students inhaling harmful chemicals, and protect their respiratory system and physical health.

2. Improve experimental safety: Good ventilation can reduce the accumulation of flammable and explosive gases, reduce the risk of fire and explosion, and provide a safer environment for experimental operation.

3. Ensure the accuracy of the experiment: Proper ventilation helps to maintain a stable temperature, humidity and air composition in the laboratory, reduce the interference of environmental factors on the experimental results, and improve the accuracy and repeatability of the experiment.

4. Protect experimental equipment: prevent corrosive gases from eroding experimental equipment, extend the service life of equipment, and reduce maintenance and replacement costs.

5. Compliance with regulatory requirements: Many education authorities and safety standards require chemistry laboratories to have good ventilation facilities, and the installation of ventilation ducts helps schools meet relevant regulations.

However, when installing ventilation ducts, it is necessary to pay attention to reasonable design and construction to ensure the effect and operation efficiency of the ventilation system. At the same time, the ventilation system should also be regularly maintained and checked to ensure that it is always in good working condition.