Hazardous-drug environments
USP <800> Airflow Visualization for Hazardous-Drug Areas
USP <800> addresses handling of hazardous drugs. Fog can reveal apparent air movement at doors, pass-throughs, hoods and room boundaries, but it does not directly quantify containment or worker exposure.
The containment question
The study should ask whether airflow direction and local behavior support the containment strategy during representative activities. Differential pressure, exhaust performance and other quantitative parameters require calibrated measurements in addition to visualization.
Critical scenarios
- Door opening and closing
- Personnel crossing the boundary
- Pass-through use
- C-PEC operation and sash position
- Material movement and waste handling
- Loss or restoration of exhaust
- Nearby supply-air interaction
Safety and contamination control
Do not introduce LN₂ fog into a hazardous-drug area until EHS, pharmacy, facilities and infection-control owners approve the tracer, water quality, cleaning approach, ODH controls and equipment placement. Fog visualization does not replace industrial hygiene or containment verification.
Applied Physics technical review
Build a defensible fogger requirement
Send Applied Physics the room, process, utilities, documentation and safety constraints—not just a model number.