How to Properly Choose and Use a Biological Safety Cabinet

Recognizing the importance of biological safety cabinets, how to properly select and use them becomes crucial. Not all safety cabinets are suitable for the same type of experiment, and incorrect selection or use can lead to serious safety risks.

Firstly, the choice depends on the type of experiment. Biological safety cabinets are categorized into Class I, Class II (which is further divided into A2, B1, B2, etc.), and Class III, based on the risk level of the biological factors being handled. Class I protects both personnel and the environment, while Class II protects personnel, the environment, and the samples, making it the most widely used type. Class III, however, offers the highest level of protection and is used for handling high-risk pathogens. Users must assess the risk based on the content of the experiment and select the appropriate level of equipment.

Proper operation is crucial during use. Avoid overloading the safety cabinet to prevent air flow disruption; perform operations at the mid-to-rear part of the workbench with gentle movements; using open flames like Bunsen burners can disrupt laminar flow, so replace them with sterile, single-use inoculating loops or electric heaters. Additionally, regular performance testing (such as air flow speed, HEPA filter integrity tests) is necessary to ensure continuous effective protection. Remember, an uncertified or improperly maintained safety cabinet can give a false sense of security, potentially posing greater risks.