PASS BOX

Interlocking Doors	The most crucial feature; one door must close before the other can open, preventing air exchange.
Material	Typically made from durable, easy-to-clean stainless steel (like 304 SS).
Visibility	Often has toughened glass windows for visual checks.
UV Germicidal Lamps	Automatically activate when doors are closed to sterilize contents.
HEPA Filtration (Dynamic Only)	Filters incoming air to create a clean environment inside.
Air Nozzles (Dynamic)	High-velocity nozzles can blow dust off surfaces.
Static Pass Box	No air filtration or circulation; transfers between areas of the same cleanliness level.
Dynamic Pass Box	Has internal fans and HEPA filters, creating a clean airflow to wash contaminants off items as they pass between different cleanliness levels (e.g., from a non-classified area to a cleanroom).

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