There are often many chemical pollution sources that are not conducive to human health in the laboratory, especially harmful gases, and it is very important to eliminate them. But at the same time, energy is often consumed in large quantities, so the requirements of the laboratory ventilation control system are getting higher, from the early CV (constant air volume), 2-State (bistable), VAV (variable air volume) systems, To the latest adaptive control system-both safety and energy saving.

　　 In short, the latest concept of the laboratory is to treat the entire laboratory as a fume hood. How to effectively control all kinds of intake and exhaust to achieve both safe and economical effects is very important.

　　The commonly used exhaust equipment in the laboratory mainly includes: fume hood, atomic absorption hood, universal exhaust hood, ceiling exhaust hood, countertop exhaust hood, etc. Among them, fume hoods are the most common. The fume hood is a ventilation device that safely handles harmful, toxic gases or vapors. Its function is to capture, seal and transfer pollutants and harmful chemical gases to prevent escaping into the laboratory, so as to inhale pollutants in the work area to keep them away The operator, to minimize inhalation contact. The air flow in the fume hood is to suck the air in the laboratory into the fume hood through the exhaust fan, dilute the contaminated gas in the fume hood and exhaust it to the outdoors through the exhaust system, which can achieve low concentration diffusion; the universal exhaust hood is The first choice for local ventilation: simple installation, flexible positioning, and good ventilation performance, which can effectively protect the personal safety of laboratory staff;

Atomic absorption hoods are mainly suitable for all kinds of large precision instruments, which require positioning and installation, and have set ventilation performance parameters. They are also one of the factors that must be considered in the overall laboratory planning; exhaust hoods are mainly suitable for chemical laboratories. It is one of the essential equipment in the overall ventilation requirements of similar laboratories.

　　Universal exhaust hood is the first choice for local ventilation: simple installation, flexible positioning, good ventilation performance, can effectively protect the personal safety of laboratory staff;