Name two main types of biosafety cabinets and describe their protection level and typical use in BEE labs.

• A. Class II cabinets provide product, personnel, and room protection; used for tissue culture and many pathogen-related work. Class III cabinets provide full, negative-pressure containment for high-risk agents; used for agents requiring total containment.
• B. Class I cabinets provide only product protection; Class II cabinets provide only room protection.
• C. Class II cabinets provide no protection; Class III cabinets provide environmental protection.
• D. Class II cabinets are used for inert samples; Class III for non-biological tasks.

Answer: (A)

Biosafety cabinets are designed to control contamination and exposure by shaping airflow and filtering air. The first cabinet type provides protection across three fronts: the sample inside stays clean, the user is shielded by the airflow and filtration, and the surrounding room is protected from any contaminants that might escape. This makes it a versatile workhorse for tasks like tissue culture and many pathogen-related experiments, where aseptic conditions are important but total containment isn’t required.

The second cabinet type is built for total containment. It is sealed and operates under negative pressure with an external exhaust that is HEPA-filtered, and procedures are done through attached gloves. This setup prevents any material from escaping to the room, offering the highest level of safety for handling the most dangerous agents or work that requires maximum containment.

In BEE labs, you’ll commonly use the first type for routine tissue culture and a wide range of organism work, while the second type is reserved for the highest-risk scenarios that require total containment.