Types of Pass Box in Cleanroom: From Standard To Air Shower, Laminar Flow, Radiation-Proof And More

Maintaining cleanliness and contamination control is one of the most critical challenges in cleanroom operations. Pass Boxes between clean and non-clean zones, minimizing cross-contamination and improving efficiency.

In this article, we will explore the different types of Pass Boxes and their applications so you can identify the right option for your cleanroom project.

What is a Pass Box?

A Pass Box is a cleanroom equipment installed on partition walls that allows the transfer of materials between rooms of different cleanliness levels. By reducing unnecessary personnel entry, it helps maintain cleanliness, saves energy, and improves operational workflow.

Pass Boxes come in multiple designs depending on specific industry needs, ranging from standard mechanical versions to advanced models with airflow systems or safety features.

Types of Pass Box

Static Pass Box

The Static Pass Box is the most common type, suitable for basic material transfer between clean and non-clean areas.

• Features: Mechanical or electronic interlock system to prevent both doors from opening at the same time.

• Application: Pharmaceutical plants, electronics manufacturing, laboratories.

• Advantage: Cost-effective and easy to install.

Dynamic Air Shower Pass Box

The Dynamic Air Shower Pass Box integrates high-velocity air nozzles that blow off dust particles from the surface of items before entry.

• Features: HEPA-filtered air jets for decontamination.

• Application: Semiconductor, aerospace, and high-precision industries.

• Advantage: Reduces particle contamination during material transfer.

Dynamic Laminar Flow Pass Box

The Dynamic Laminar Flow Pass Box creates a unidirectional airflow (usually vertical) to protect products during transfer.

• Features: Built-in HEPA filter and blower unit.

• Application: Biotechnology, sterile pharmaceutical production.

• Advantage: Provides controlled airflow, ensuring contamination-free transfer.

X-ray Protection Pass Box

For industries involving radioactive materials, the X-ray Protection Pass Box provides enhanced safety.

• Features: Lead-lined panels and radiation-proof glass.

• Application: Nuclear medicine, isotope laboratories.

• Advantage: Ensures operator protection during transfer of sensitive materials.

VHP Pass Box

This type uses Xenon lamp or UV light sterilization to disinfect materials inside the chamber.

• Features: Built-in germicidal lamps for sterilization.

• Application: Pharmaceutical, microbiology, food processing labs.

• Advantage: Kills bacteria and microorganisms, ensuring sterile conditions.

Electric Lift Door Pass Box

An advanced option for automation, the Electric Lift Door Pass Box improves ease of use.

• Features: Motorized vertical sliding door, electronic control system.

• Application: Modern cleanroom facilities with high-frequency transfers.

• Advantage: Improves workflow efficiency and operator convenience.

Choosing the Right Pass Box

The choice of Pass Box type depends on:

• The cleanliness class of your cleanroom.

• The type of materials being transferred.

• Safety requirements (e.g., radiation protection, sterilization).

• Budget and installation preferences.

For example

A Static Pass Box is sufficient for general applications.

If sterility is a priority, consider Dynamic Laminar Flow or UV Sterilization Pass Box.

For highly sensitive industries, X-ray Protection Pass Box ensures safety.

If your facility requires automation, an Electric Lift Door Pass Box offers efficiency.

Conclusion

Pass Boxes play a vital role in ensuring contamination control, operational efficiency, and safety in cleanroom environments. From standard models to advanced solutions like air showers, laminar flow, or radiation-proof systems, there is a Pass Box for every application.

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