The fume hood is to protect the operator. It is sucked by the external exhaust system to maintain a certain suction surface wind speed of the front window of the fume hood, so that the aerosol pollution in the fume hood will not escape through the front window and protect the operator from Contamination from in vivo operations.

In general, laboratory fume hoods are required when using hazardous chemicals that are: Acutely toxic, carcinogenic, or have reproductive hazards. Highly reactive. Volatile (e.g., solvents) or easily dispersible in air. Substances with uncharacterized hazards. Nanoparticles. Stench chemicals or that have a low odor threshold.