Cleanroom Pass Box Selection Guide: Static, Dynamic & VHP Types

A cleanroom pass box provides a controlled route for transferring materials between rooms or areas with different cleanliness requirements. Choosing the right type helps organize material flow, reduce unnecessary personnel movement and maintain the intended separation between areas.

However, not every pass box performs the same function. A static pass box is designed for routine material transfer, a dynamic pass box may include additional air-treatment functions, and a VHP pass box is designed for a sterilization process using vaporized hydrogen peroxide.

This guide compares the main pass box types, explains important purchasing specifications and introduces GCC pass box configurations to help buyers select a suitable solution.

1. What Is a Cleanroom Pass Box?

A cleanroom pass box, also known as a pass-through box or transfer hatch, is installed in a wall or partition to transfer materials between adjacent areas without requiring operators to pass directly between them.

Typical applications include pharmaceutical facilities, laboratories, hospitals, electronics manufacturing and other controlled environments.

A pass box generally consists of a chamber, two access doors, a door interlocking system and an enclosure. Depending on the model, additional functions may include air filtration, UV lamps, automatic doors or a VHP sterilization system.

For an introduction to the basic design and operating principle, read our guide to pass-through windows and their working principles.

The required configuration depends on the materials being transferred, the cleanliness requirements of each area, transfer frequency and the facility's operating procedures.

2. Static, Dynamic, VHP or Special-Function Pass Box?

Static Pass Box

A static pass box is a basic material transfer unit without a built-in air-cleaning or sterilization cycle. Its primary functions are to provide a transfer chamber and help maintain separation between the two sides through a door interlocking system.

Static pass boxes are suitable for routine material transfer when the facility's contamination-control procedures do not require an additional air-treatment or sterilization process inside the chamber.

When selecting a static pass box, check the usable chamber dimensions, construction materials, door interlock, installation opening and cleaning requirements.

Dynamic Pass Box

A dynamic pass box is intended for applications where additional air treatment may be required during material transfer. Depending on its design, it may incorporate a fan, air filtration, UV lamps or other optional functions.

Not every dynamic pass box has the same configuration. Buyers should confirm whether HEPA filtration, a fan, UV treatment, differential-pressure monitoring or a defined air-cleaning cycle is included in the selected model.

Learn more about the structural features and working principle of an air shower pass box. The actual configuration of a dynamic pass box should always be checked against its own technical specifications.

GCC offers three listed dynamic pass box models: GCC-PB-500, GCC-PB-600 and GCC-PB-700. Their listed features include stainless steel working chambers, electronic interlocking and an embedded-door design.

The listed internal chamber sizes are 500 × 500 × 500 mm, 600 × 600 × 600 mm and 700 × 700 × 700 mm, respectively. Different sizes and interlocking configurations can be discussed according to project requirements.

VHP Sterilization Pass Box

A VHP pass box uses vaporized hydrogen peroxide as part of a controlled sterilization process. It is intended for applications where material transfer requires a defined sterilization cycle rather than basic transfer or routine surface cleaning.

Depending on the equipment design, a VHP system may include a sterilant generation system, process monitoring, humidity control and a residual hydrogen peroxide removal stage.

When evaluating a VHP pass box, ask for the applicable cycle parameters, material compatibility, sterilization validation evidence, biological indicator results where required, residual hydrogen peroxide release criteria and cycle records.

Sterilization performance should be assessed using the actual equipment configuration and validated operating conditions. Do not assume a particular log-reduction level or cycle time without supporting technical documentation.

Special-Function Pass Box: Electric Lifting Type

Some applications require features beyond routine material transfer or air treatment. An electric lifting pass box may be considered when automatic vertical door movement, hands-free operation or operator communication is important.

GCC model GCC-CDC-9712-DD is a representative electric lifting configuration. The supplied specifications list a 650 × 600 × 1200 mm overall size, SUS304 stainless steel construction, a 50 kg load capacity, an infrared sensor, touch-rebound control, a lifting speed of 30–50 mm/s, a UVC 254 nm lamp and a two-way intercom.

The listed safety features include anti-pinch, overload protection and an emergency stop. Confirm the final configuration and intended application before ordering.

In summary, a static pass box is designed for routine transfer, a dynamic pass box may add air treatment, a VHP pass box is intended for a defined sterilization process, and a special-function model addresses specific workflow requirements.

3. Key Differences at a Glance

The most suitable type is determined by the required contamination-control process, not by the product name alone.

4. GCC Dynamic Pass Box: Models and Specifications

GCC offers three listed dynamic pass box models for different material transfer requirements.

Technical Specifications

The listed specifications identify stainless steel for both the interior and exterior of these three configurations. Cold-rolled steel exterior construction may be discussed as an alternative for suitable applications, subject to technical confirmation for the selected model.

The external dimensions should be confirmed against the final technical drawing before ordering. This is especially important when planning the wall opening, panel thickness, mounting depth and sealing details.

Key Features

Double-door electronic interlocking: The interlocking system is designed to prevent both doors from being opened simultaneously during normal operation. Confirm the actual interlock logic and power-failure behavior with the manufacturer.

Stainless steel working chamber: Smooth stainless steel interior surfaces support routine cleaning and maintenance.

Durable enclosure options: Stainless steel is listed for the three models above. Alternative exterior materials should be specified and confirmed before production.

Sealing strips: Sealing strips help improve the fit between the doors and enclosure. Actual leakage performance depends on the complete design and installation.

Embedded-door design: The compact door arrangement supports installation in a partition and convenient material transfer.

Flexible sizing and configuration: Different chamber sizes and interlocking configurations can be discussed according to the transfer load and site requirements.

Easy cleaning and maintenance: Smooth internal surfaces can help simplify routine cleaning. The cleaning procedure should follow the facility's operating requirements.

Configuration confirmation: HEPA filtration, fan-assisted airflow, UV lamps and other air-treatment functions should be confirmed against the final model configuration rather than assumed to be included in every unit.

For model-specific details, refer to the GCC pass box product page and confirm that the listed configuration matches your required model.

5. How to Choose the Right Pass Box Size

Selecting a pass box based only on its external appearance can lead to loading difficulties or installation problems. Start with the materials that will actually pass through the chamber.

Consider the following points:

Maximum load dimensions: Measure the largest container, tray, cart or package.

Handling clearance: Allow space for operators to place and retrieve materials comfortably.

Transfer frequency: Consider how often the pass box will be used and whether a special transfer sequence is required.

Wall opening and panel thickness: Check the installation dimensions and how the unit will be fixed and sealed.

Material compatibility: Select the chamber and enclosure materials according to the cleaning agents and operating environment.

Utilities and optional functions: Confirm the power supply and any additional utilities required by the selected configuration.

For conveyor-fed materials, unusually large packages or integration with automated equipment, review the transfer arrangement before the pass box is manufactured.

6. Materials, Interlocking and Optional Functions

Stainless Steel or Cold-Rolled Steel?

Stainless steel is commonly selected for cleanroom equipment because it is durable and suitable for routine cleaning. The appropriate grade and surface finish depend on the application, cleaning chemicals and project requirements.

Cold-rolled steel with a suitable coating may be considered for applications where the cleaning regime and environmental conditions permit it. Confirm the material specification before ordering, especially for pharmaceutical or other tightly controlled environments.

Door Interlocking

The door interlock is a key feature of a double-door pass box. It helps prevent a direct opening between the two connected areas during normal operation.

Before acceptance, verify the opening sequence, door-release logic, alarms if fitted, emergency access arrangements and behavior during power failure. The final requirements should be documented in the equipment specification.

UV Lamps and Air Filtration

UV lamps and air filtration perform different functions. UV treatment may be used as part of a defined surface-treatment procedure, but it should not automatically be treated as proof of sterilization. Air filtration can help control airborne particles when the system is appropriately designed and maintained.

If either function is required, specify the intended purpose, operating sequence, monitoring requirements and maintenance procedure. Confirm the exact functions supplied with the selected model.

7. VHP Pass Box: What Buyers Should Verify

For projects requiring a VHP sterilization pass box, the purchase specification should address more than the chamber dimensions.

Confirm:

The intended materials and their compatibility with the VHP process.

The sterilization cycle parameters and applicable validation requirements.

The monitoring and recording functions supplied with the equipment.

The process for removing residual hydrogen peroxide before the door is released.

Required utilities, exhaust arrangements and installation conditions.

The documentation, operating procedures and maintenance requirements to be delivered.

The required sterilization performance and cycle time should be agreed with the supplier and verified through appropriate testing. They should not be inferred from the VHP label alone.

8. Operation, Maintenance and Qualification

Correct operation is essential for maintaining the intended function of a pass box. Operators should follow the specified door sequence, cleaning procedure and transfer instructions.

For practical operating guidance, refer to the Air Shower Pass Box Operation Manual. For routine care, inspection and maintenance considerations, read the GCC Series Air Shower Pass Box: Complete Guide to Safe Use and Maintenance.

For projects with formal qualification requirements, agree on the required installation checks, interlock tests, operating procedures and documentation before purchase. Additional testing may be necessary for filtration or VHP sterilization functions, depending on the equipment configuration and project requirements.

9. Cleanroom Pass Box Purchasing Checklist

Before placing an order, confirm the following:

Pass box type: static, dynamic, VHP or special-function.

Internal chamber dimensions and maximum transfer load.

Exterior and interior materials and surface finish.

Door interlocking requirements and power-failure behavior.

Whether HEPA filtration, UV lamps or other optional functions are required.

Installation opening, wall thickness and sealing requirements.

Power supply and any additional utilities.

Cleaning, operation and maintenance procedures.

Technical drawings, acceptance checks and required documentation.

Any project-specific cleanliness or sterilization validation requirements.

Providing these details early helps the manufacturer recommend a configuration that fits the intended application.

Frequently Asked Questions

What is the difference between a static and dynamic pass box?

A static pass box provides a transfer chamber and door interlocking. A dynamic pass box may add air treatment, such as fan-assisted filtration, depending on its configuration. Confirm the functions of the actual model before purchasing.

Does every dynamic pass box include HEPA filtration?

No. The word “dynamic” alone does not establish which filtration or airflow functions are included. Confirm the fan, filter grade, airflow performance and any cleaning cycle in the technical specification.

Can a standard pass box replace a VHP sterilization system?

A standard static or dynamic pass box should not be treated as equivalent to a validated VHP sterilization process. If sterilization is required, specify the process and validation requirements for the VHP equipment.

How do I select the correct chamber size?

Measure the largest item to be transferred and allow sufficient handling clearance. Confirm the usable internal dimensions, door opening and installation requirements against the actual equipment drawing.

Can a pass box be customized?

Different sizes, materials and interlocking configurations may be available, subject to model design and technical confirmation. Additional functions such as filtration or UV treatment should be specified separately.

Need Help Selecting a Cleanroom Pass Box?

Choosing a suitable cleanroom pass box depends on the transferred materials, chamber dimensions, installation conditions, interlocking requirements and any additional air-treatment or sterilization functions.

GCC provides pass box configurations for different cleanroom, laboratory and industrial applications. Share your required internal dimensions, material specification, transfer process and optional functions with our team to discuss a suitable configuration.

For a technical inquiry, please include the application, required chamber size, installation opening, preferred materials, power supply and any specific cleanliness or sterilization requirements.