Clean Room Pass Box

“JB TECH” A clean room pass box works by acting as a controlled, interlocked barrier between areas of different cleanliness levels, ensuring only one door opens at a time to prevent contamination. It minimizes air exchange, often featuring HEPA filtration (dynamic) and UV sterilization to clean materials during transfer.

Types of Pass Box:

Static Pass Box

Also known as a Passive Pass Box, this is the more cost-effective and traditional design.

• Concept: It creates a physical barrier to facilitate the quick transfer of non-sensitive products.
• Components: Typically includes a stainless steel body (SS 304), interlocked doors, and a UV lamp (often ~8W) for surface sterilization of the material during its “residence time” inside the box.
• Limitation: It should never be used to transfer materials between rooms with different air classifications, as it cannot actively remove airborne contaminants.

Dynamic Pass Box

Also known as an Active Pass Box, this is a sophisticated unit designed for high-risk environments.

• Concept: It actively manages air quality through a “self-cleaning” cycle. Before a transfer is completed, HEPA-filtered air removes particulates from the surface of the items and the internal chamber.
• Key Features:
  • Motor Blower: Circulates air at a velocity of approximately 0.45 m/s.
  • High-Power UV: Often uses an 18W lamp for more intensive germicidal action.
  • Validation Ports: Includes DOP/PAO test ports to allow for HEPA filter integrity testing.
• Variants: Specialized models may include integrated air showers or Vaporized Hydrogen Peroxide (VHP) generators for advanced bio-decontamination.

Air Shower Pass Box

An air shower pass box acts as a specialized, interlocked cleaning chamber for transferring materials between cleanrooms of different cleanliness levels. It uses high-velocity HEPA-filtered air (less than 20 m/s)   to purge surface particles, with electronic interlocking preventing both doors from opening simultaneously to maintain pressure and sterility.

Pass Through Chamber (Hatch Box)

A pass-through chamber (hatch box) operates on the principle of a sealed, interlocked, dual-door system designed to transfer items between controlled environments (e.g., cleanrooms) without direct human passage.

Biological Pass Box

A biological pass box (or pharmaceutical pass box) operates on the principle of preventing cross-contamination during material transfer between areas of different cleanliness levels, typically using interlocked doors, HEPA-filtered air (dynamic), and germicidal UV light (static/dynamic). It acts as a physical barrier that ensures only one door opens at a time, maintaining pressure differentials and sterilization.

FLP (Flame Proof) Pass Box

An FLP (Flameproof) Dynamic Pass Box operates on the principle of providing a safe, contamination-free, and ignition-proof transfer of materials between classified hazardous areas (e.g., Zone 1 & 2) and cleanrooms. The electrical enclosure is designed to withstand an internal explosion without transmitting it to the outside, cooling any escaping hot gases through a specific “flamepath”.

Where They’re Used:

Dimension in Size: