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Biosafety Cabinet NSF 49 - 2018 Annex E
Each Type B1 or Type B2 Biosafety Cabinet must have its own dedicated exhaust ducting and fan.
In my opinion - Avoid Type B1 & B2 BSCs.
E.3.1.1 Canopy-connected Types A and C1 require a consistent, low static pressure. While a dedicated exhaust system is preferred, they may share a common exhaust system with other exhausted laboratory devices, if properly balanced;
Type B BSCs require a higher static pressure that must increase as their exhaust filters load. They must be on a dedicated exhaust system, and not be ganged with other Type B BSCs, or other exhausted laboratory devices requiring a lower static pressure (e.g., fume hoods, canopy-connected BSCs);
Dr Gilpin's publications - Research Gate