Class II biosafety cabinets are somewhere in-between—specifically, they contain partial barrier systems that rely on the movement of air to provide personnel, environmental, and product protection. These are covered in NSF/ANSI 49, which has just been revised. The current edition of this American National Standard is NSF/ANSI 49-2018: Biosafety Cabinetry – Design, Construction, Performance, And Field Certification. NSF/ANSI 49-2018, like its predecessor, applies to Class II, or laminar flow, biosafety cabinets designed to minimize inherent hazards in work with agents assigned to biosafety levels 1, 2, 3, or 4. It outlines basic guidelines for their design, construction, and performance. BSCs designed and tested under NSF/ANSI 49-2018 guidance are assured reliable operation, durability and structural stability, cleanability, limitations on noise level, illumination, vibration, and motor/blower performance.
Read more at the ANSI Blog: NSF/ANSI 49-2018: Biosafety Cabinets – Design, Construction, Performance, And Field Certification
https://blog.ansi.org/?p=160368
Annex E, free of charge
HERE
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