The laboratory workers all hope that their units can provide them with a good workplace. The purpose of setting up the fume hood in the laboratory is to control the harmful gases most directly, and eliminate it before it is completely diffused. It is most effective. The way is to directly control and capture them at the point of generation of harmful gases and discharge them outdoors. Laboratory ventilation and comfort air conditioning systems have different ventilation design requirements. The main purpose is to provide a safe and comfortable working environment and reduce the exposure of personnel to danger. Under the possibility of air, ventilation mainly solves the problems of the working environment on the physical health and labor protection of the experimental personnel.