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Biological safety cabinets can provide a sterile dust-free environment for the operation of filter media experiment in order to avoid the interference of external factors on the filter bacteria breeding test. The HEPA filter is installed in the biological safety cabinet. The vertical laminar airflow filtered through the HEPA filter is blown down from the top of the cabinet, leading to that the filtered airflow is continuously blown through the working area of cabinet to protect tested samples from dust and bacteria.
