What type of biological safety cabinet filters at least 99.97% of airborne particles?

Biological safety cabinets are essential in laboratories for providing protection to personnel, the environment, and the samples being handled. Class II biological safety cabinets are specifically designed to filter at least 99.97% of airborne particles, including harmful microorganisms. These cabinets utilize high-efficiency particulate air (HEPA) filters to achieve this level of filtration, which is crucial in reducing the risk of exposure to potentially hazardous agents.

Class II cabinets also provide a sterile working environment while allowing air to flow safely and efficiently. They create a barrier to contamination, ensuring that any particles generated during procedures do not escape into the laboratory environment. This capability is especially important when working with microorganisms or biological materials that may pose a health risk.

In contrast, other classes of biological safety cabinets either provide different levels of protection, function, or are intended for other specific uses. Understanding the distinct features and levels of protection offered by each class helps ensure that laboratory personnel use the appropriate equipment depending on the nature of the work being performed.