Fume hood is an essential kind of laboratory furniture. In the chemical laboratory, various harmful gases, odors, moisture, inflammable, explosive and corrosive substances are produced during the experimental operation. In order to protect the safety of users and prevent the diffusion of pollutants in the experiment to the laboratory, a fume hood should be used near the pollution source. Then, in the daily experiment process, how should the experimenter use the fume hood correctly and safely, and what precautions should be taken? Today, Xiaobian will introduce it to you.