When necessary, at least one laboratory shall be equipped with a biosafety cabinet.

Level II biosafety cabinets are generally used in BSL-4 laboratories, which are rarely used in primary hospitals and are generally not considered.

Biosafety cabinet (BSC) is a box-type negative pressure safety device for air purification, which can prevent some dangerous or unknown biological particles from escaping during the experimental operation. It is widely used in scientific research, teaching, clinical examination and production in microbiology, biomedicine, genetic engineering, biological products and other fields, and is the most basic safety protection equipment in the first-class protective barrier of laboratory biosafety.