NSF 49 - 2018 Annex E - Available

December 5, 2018 News about biosafety
Control of Biohazards Course Newsletter Archive
Dr Richard W Gilpin RBP CBSP SM(NRCM) 
Author, Public Speaker, Trainer, Former Medical School Faculty
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NSF International Publication: NSF 49 - 2018 Annex E - Available
"Biosafety cabinet selection, installation, use, lifespan, and decommissioning"

Distributed for informative / educational purposes – this document is not for sale. This document is the United States normative reference for biosafety cabinet (BSC) practices.

E.3.1.5  Question five: If the exhaust system malfunctions, does the user understand its impact on the BSC’s ability to maintain personnel and environmental protection, i.e., containment?
For a Type A BSC fitted with a properly designed canopy connection, reduction or elimination of the exhaust air should not significantly affect the airflow patterns within the BSC. 
 For a Type B BSC, a significant loss of exhaust airflow will result in an alarm, turning off the cabinet blower(s). This stops the flow of air into the front of the BSC (inflow), negating personnel protection, potentially allowing materials in the work area of the BSC to escape into the laboratory.

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Dr Richard W Gilpin RBP CBSP SM(NRCM) - December 5, 2018

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