law://uk/uksi/1992/3217@2026-11-12| Containment Levels | |||
|---|---|---|---|
| B2 | B3 | B4 | |
| SPECIFICATIONS | |||
| 1 Viable micro-organisms should be contained in a system which physically separates the process from the environment (closed system) | Yes | Yes | Yes |
| 2 Exhaust gases from the closed system should be treated so as to: | Minimise release | Prevent release | Prevent release |
| 3 Sample collection, addition of materials to a closed system and transfer of viable micro-organisms to another closed system, should be performed so as to: | Minimise release | Prevent release | Prevent release |
| 4 Bulk culture fluids should not be removed from the closed system unless the viable micro-organisms have been: | Inactivated by validated means | Inactivated by validated chemical or physical means | Inactivated by validated chemical or physical means |
| 5 Seals should be designed so as to: | Minimise release | Prevent release | Prevent release |
| 6 Closed systems should be located within a controlled area | Optional | Optional | Yes, and purpose-built |
| a Biohazard signs should be posted | Optional | Yes | Yes |
| b Access should be restricted to nominated personnel only | Optional | Yes | Yes, via airlock |
| c Personnel should wear protective clothing | Yes, work clothing | Yes | Yes, A complete change |
| d Decontamination and washing facilities should be provided for personnel | Yes | Yes | Yes |
| e Personnel should shower before leaving the controlled area | No | Optional | Yes |
| f Effluent from sinks and showers should be collected and inactivated before release | No | Optional | Yes |
| g The controlled area should be adequately ventilated to minimise air contamination | Optional | Optional | Yes |
| h The controlled areas should be maintained at an air pressure negative to atmosphere | No | Optional | Yes |
| i Input air and extract air to the controlled area should be HEPA filtered | No | Optional | Yes |
| j The controlled area should be designed to contain spillage of the entire contents of the closed system | Optional | Yes | Yes |
| k The controlled area should be sealable to permit fumigation | No | Optional | Yes |
| 7 Effluent treatment before final discharge | Inactivated by validated means | Inactivated by validated chemical or physical means | Inactivated by validated physical means |
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