How to distinguish biosafety cabinet, fume hood and clean bench

1、 Fume hood
The fume hood is designed to remove corrosive chemical gases and toxic fumes during chemical experiments. Because there is no HEPA filter, the fume hood cannot effectively remove microbial media. Microbial samples placed in the fume hood will spread outside the fume hood and pollute the laboratory environment.
The fume hood is an indispensable part of the laboratory ventilation design. In order to prevent laboratory staff from inhaling or swallowing some toxic, disease-causing or unknown toxic chemicals and organisms, the laboratory should have good ventilation.
In order to prevent the absorption of some vapors, gases and particles (smoke, soot, dust and aerosols), the pollutants must be removed by means of fume hood, ventilation hood or local ventilation.
The most important function of the fume hood is the exhaust function. In the chemical laboratory, various harmful gases, odors, moisture and flammable, 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, the fume hood should be used near the pollution source.
The fume hood only serves as an auxiliary function of the test bench. In order to improve the experimental environment, the experiments carried out on the experimental platform are gradually transferred to the fume hood, which requires that the fume hood should have the most suitable functions for the use of equipment. In particular, most newly built laboratories require air conditioning, so the number of fume hoods should be included in the air conditioning system plan at the preliminary design stage of the building.
Since fume hood plays a very important role in physical and chemical laboratories, the number of fume hoods used has increased by leaps and bounds in terms of improving laboratory environment, improving labor hygiene conditions and improving work efficiency.
2、 Ultra-clean workbench
Ultra-clean bench (ultra-clean bench) is designed to protect the test article or product. It can prevent the test article or product from being polluted by dust or bacteria outside the working area by blowing the vertical or horizontal laminar air in the working area. Once the microbe sample is placed in the work area, the laminar air will blow the air with microbe medium to the front desk staff and cause danger.
The advantages of ultra-clean worktable are easy to operate, comfortable, efficient, short preparation time, and basically ready to use.
This is a general type of local purification equipment. The air flow is in the form of vertical laminar flow and horizontal laminar flow. It can create a local high cleanliness air environment. It is the most ideal special equipment for scientific research, pharmaceutical, medical and health, laboratory testing and other industries.
In the factory production, when the inoculation workload is large and needs to work for a long time, the ultra-clean table is a very ideal equipment.
3、 Biosafety cabinet

The biosafety cabinet is designed to protect the operator, the laboratory environment and the experimental materials from being exposed to the infectious aerosols and splashes that may occur during the operation of the primary culture, bacterial strains, diagnostic samples and other infectious experimental materials.

Biosafety cabinet can provide comprehensive protection for operators, samples and environmental protection; Unlike the biosafety cabinet, the ultra-clean table can only protect the sample, not the operator; The use of fume hood in the laboratory is to ensure the safety of users and prevent pollution to the surrounding environment.
In addition, it is particularly important to note that fume hoods and ultra-clean workbenches are not biosafety cabinets and cannot be used in experiments or production processes involving microbial materials.