Biosafety cabinet class II

This BSC protects both the operator and the environment from exposure to biohazards. In addition, BSC Class II also protects the sample from external contamination. This extra protection is induced by an additional airflow that carries possible contaminants from the operator away from the sample.

Room air flows in through the front. HEPA-filtered air flows downward from the top and pushes contaminated air through vents in surface down toward a blower that pumps contaminated air up to the HEPA filter at the top where clean air is released through the top and pushed back down into the cabinet.

Figure: Biosafety cabinet class II. A: front opening. B: window/ viewing panel. C: exhaust HEPA filter. D: supply HEPA filter. E: rear plenum. F: blower.

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Biosafety Cabinet