Biosafety and Facility Management
What this domain tests
The Biosafety and Facility Management domain examines whether you can translate a containment level into concrete building, equipment, and operating controls. Expect questions on BSL1–BSL4 design, primary and secondary barriers, directional airflow, HEPA filtration, biosafety cabinet classes, autoclave validation, waste routes, access control, and maintenance under containment.
Core rules
- Primary barrier protects the worker and the immediate workspace: biosafety cabinet (BSC), sealed centrifuge cup, HEPA-filtered exhaust, PPE.
- Secondary barrier protects the building and environment: laboratory walls, pressure cascade, airlocks, waste treatment, restricted access.
- Airflows from clean to contaminated. A BSL-3 suite typically has the laboratory negative to the anteroom and the anteroom negative to the corridor; the pressure gradient, not noise or signage, is the evidence.
- Class II BSC is the standard for cell culture and many infectious procedures; a chemical fume hood is not a biological containment device because it does not filter exhaust back into the room.
- Autoclave efficacy is proven by biological indicators (Geobacillus stearothermophilus spores) and load-specific validation; autoclave tape is only a process indicator.
- HEPA filters must be certified, leak-tested, and replaced by trained staff under safe procedures; UV lamps are supplemental surface disinfection only, not a substitute for cleaning.
Worked example
A BSL-3 laboratory reads −30 Pa relative to the anteroom, the anteroom reads −15 Pa relative to the corridor, and the corridor is at ambient pressure. Is the cascade acceptable? Yes. Air moves corridor → anteroom → laboratory, so clean air moves toward the contaminated zone. The reverse cascade (laboratory positive to anteroom) would be a critical failure. The reasoning is directional containment, not simply “negative pressure.”
Traps that cost marks
- Treating a fume hood as a BSC.
- Assuming a negative-pressure room is automatically BSL-3.
- Using autoclave tape as validation.
- Forgetting pass-through interlock, emergency power, or pest control.
- Ignoring maintenance and certification records.