• Cleanroom Pass Box Solutions for Controlled Material Transfer

    ISO5/GMP compliant pass box manufacturer
    Custom static, dynamic, laminar flow and GMP pass boxes engineered for safe material transfer between cleanrooms and controlled environments.

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    Pass box
  • Pass Box with UV sterilization and interlocking
  • LAF pass box
  • cargo pass box with air shower
  • Pass box with air shower
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What Is a Cleanroom Pass Box?

Pass Box (also known as a Pass Through, Pass-Through Chamber, or Transfer Hatch)  is a controlled transfer chamber used to move materials between adjacent cleanroom or controlled areas while reducing unnecessary personnel movement and cross-contamination risks.

Depending on the process, pass boxes can be configured with door interlocks, HEPA-filtered airflow, laminar flow, air-shower nozzles, UV-C, conveyor systems and project-specific controls.

  • Controlled material transfer
  • Mechanical or electronic interlocking
  • Static or HEPA-filtered airflow options
  • SS304 / SS316L construction
  • Custom sizes and wall integration
  • GMP-oriented configurations available
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Explore Our Pass Box Solutions

Select from static, dynamic and GMP-oriented pass box configurations for different cleanroom classifications, transfer processes and project requirements.

Custom SUS roller conveyor dynamic pass box

Dynamic Pass Box with Roller Conveyor

Designed for automated or high-throughput material transfer and integration with production lines.
cargo pass box with air shower

Custom GMP Pass Box

Project-specific configurations for pharmaceutical and GMP cleanroom applications.
GMP LAF Pass Box

Laminar Flow Pass Box

HEPA-filtered unidirectional airflow provides enhanced protection for critical material transfer.
Pass box with air shower

Pass Box with Air Shower

HEPA-filtered air shower removes surface particles from transferred materials before entry into the cleaner area.
Pass Box with UV sterilization and interlocking

Static Pass Box

For transfer between areas with similar cleanliness requirements where active airflow is not required.

Which Pass Box Is Right for Your Cleanroom?

PRODUCT TYPE

Static  

Dynamic / Air Shower

Laminar Flow

Roller Conveyor

GMP
Airflow System No active airflow HEPA filtered Unidirectional HEPA airflow Optional Project specific
Typical Transfer General materials Particle-sensitive materials Critical materials Continuous / automated GMP process
HEPA Filter — ✓ ✓ Optional Optional / Required by design
Air Shower — ✓ — Optional Optional
Interlock ✓ ✓ ✓ ✓ ✓
Typical Application General cleanroom Pharma / electronics Critical transfer Production lines Pharmaceutical / biotech

Not sure which configuration fits your project?
Flair can recommend a pass box configuration based on room classification, transfer process, wall construction and material flow.

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Why Cleanroom Contractors And EPCs Choose Flair Pass Box Solutions

With over 18 years of manufacturing experience, Flair supports cleanroom projects with configurable pass box solutions, engineering coordination and factory-tested equipment.

  • Project-Based Engineering Support

    2D/3D drawings and engineering support for dimensions, airflow, controls and installation interfaces based on project requirements.

  • Multiple Pass Box Configurations

    Static, dynamic, laminar flow, air shower, conveyor and GMP-oriented configurations for different material transfer processes.

  • Cleanroom Wall Integration

    Customized around wall thickness, opening dimensions and installation conditions for coordinated cleanroom integration.

  • Configurable Interlocking & Controls

    Mechanical or electronic interlocks with optional PLC/HMI controls and project-specific operating logic.

  • Reliable & Maintenance-Friendly Design

    Durable stainless steel construction, quality hardware and serviceable components designed for long-term cleanroom operation.

  • Factory Assembly & Testing

    Pre-assembly, functional testing and project documentation before delivery help simplify installation and commissioning.

Key Engineering Features Across Our Pass Box Range

Engineering features and optional configurations are available according to pass box type, cleanroom classification and project requirements.

Stainless steel pass box

GMP Radius-Corner Chamber

SS304/316L construction with radius-corner interior options helps minimize dead zones and supports easier cleaning.

High-Integrity Door Sealing Pass Box

High-Integrity Door Sealing

Durable sealing gaskets and precision door construction help reduce air leakage and support controlled transfer conditions.

Configurable Airflow Systems

Configurable Airflow Systems

Air-shower nozzles or laminar-flow diffusers can be configured according to the required material-transfer process.

Stainless steel handle for pass hatch

Door Interlocks & Process Timing

Mechanical or electronic interlocks prevent simultaneous door opening, with configurable timing for controlled transfer cycles.

Sterilizer Pass box with air shower

UV-C / LED / Internal Accessories

Optional UV-C lamps, LED lighting and other internal accessories can be configured according to process requirements.

Pass Box PAO-DOP Testing Ports

PAO / DOP Testing Provisions

Optional aerosol injection and sampling provisions support HEPA filter integrity testing on applicable pass box configurations.

GMP laminar flow (LAF)/DOP pass boxes

  • cargo pass box with air shower
  • Low-cost and simple control system
  • All stainless steel plates,R-arc corners
  • Reliable Mechanical/electronic Interlocking
  • Customized error alarm
  • View glass window
  • Indicators prompt
  • Interphone
  • UV lamp
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Custom Pass Box Engineering And Cleanroom Integration

Engineered around your cleanroom layout, wall construction, material flow and process requirements.

Customizable Parameters

  • Chamber dimensions
  • Wall thickness / opening size
  • SS304 / SS316L construction
  • Door orientation & interlocking
  • Airflow / HEPA configuration
  • PLC / HMI & project controls
  • Conveyor / production-line interface
  • Electrical requirements
DISCUSS YOUR PROJECT
Sterilizer Pass box with air shower

From Requirement to Installation

Requirements / Layout

01

Engineering Drawing

02

Manufacturing / FAT

03

Delivery / Installation

04

Testing / Commissioning

05

Pass Box Applications in Cleanrooms & Controlled Environments

Flair pass boxes support controlled material transfer across pharmaceutical, biotechnology, laboratory, electronics, food and medical device facilities. Configurations can be tailored to cleanroom classification, transfer process, airflow requirements and installation conditions.

Custom Pharmaceutical GMP pass box/Pass Through

Biotechnology & Life Sciences

Controlled material transfer between classified processing and research areas.

GMP dynamic pass box/Pass Through for ISO5 Pharmaceutical cleanroom

Laboratories & Healthcare

Controlled transfer of samples, materials and supplies between laboratory and clean areas.

Dynamic Pass box with air shower

Pharmaceutical Manufacturing

Controlled material transfer between classified production and processing areas.

Stainless steel dynamic pass box for pharmaceutical cleanroom

Food & Controlled Processing

Hygienic material transfer between controlled production and packaging areas.

semiconductor cleanroom air shower pass box

Semiconductor & Electronics

Controlled component and material transfer between clean production zones.

Custom GMP/ISO5 pass box manufacturer

Medical Device Manufacturing

Controlled transfer of components, materials and packaged products between clean production areas.

FAQs

Find answers to frequently asked questions about our products. See the most common topics and more. Any other questions just feel free to contact us.

Tools & Materials Needed

  • Tools: Tape measure, level,  pencil, utility knife (for drywall), circular saw (for cutting opening), drill, screwdriver set, caulking gun, step ladder.

  • Materials: Pass box , silicone sealant (cleanroom-grade or non-yellowing), mounting screws or bolts , shims/packers, fire-rated foam (if required), plastic sheeting (to protect unit during installation)

Step-by-Step Installation Process

    A. Preparation & Marking

    B. Cutting the Wall Opening

   C. Dry-Fit & Leveling

   D. Fasten  and Screw

   E.Sealing and clean the surface

   F.Test & Verify

What’s more,Proper installation ensures the pass box functions as intended, maintaining the integrity, safety, and cleanliness of the adjoining spaces.

Cleanroom pass boxes come with different features and sizes, So It is important to choose the right one for your cleanroom,

There are available in 3 different types,the main differences are the ventilation and contamination filtering.

  • Static/Passive pass box: transfer the material to two clean room which have classified,and has no air supply or extract. It is also known as passive pass box and equipped with UV light.
  • Dynamic/Active  pass box: between classified and non-classified areas. Material is passed through vertically HEPA filtered air.completely integrated within the partition wall. Designed to transfer the materials in cleanroom environment making sure that there is not much movement.
  • Laminar flow (Biological )pass box:  with built-in motor and GEL HEPA filter (H14),the air blows from the SUS diffuser by undirectional flow .To Meet the GMP requirements.

A dynamic pass box is a device with built-in motor and HEPA filter to supply air from Nozzles or diffuser, the air passed through HEPA H13/14 filters  is blowing over the material.

They are usually applied to transfer the material between non-cleanroom  to cleanroom  or between two cleanrooms with different levels.Transfering material from Class D ( ISO 8) to Class C ( ISO 7) would require a Dynamic Pass-Through Hatch.

Air Circulation System and Velocity

                                          

LAF Pass box

with undirectional airflow from diffuser into the side

Dynamic pass box

The airflow is through built-in air nozzles.

Feature Static Pass Box Dynamic Pass Box Laminar Flow (LAF) Pass Box
Cleanliness Grade Between equal classes Low to high class (e.g., ISO 8 to 7) Aseptic/Grade A environments
Airflow None (Passive) Built-in FFU (Internal Air) Vertical Unidirectional Flow
Interlock Type Mechanical or Electronic Electronic with Timer PLC Controlled Electronic
Core Application Electronics/General Labs Pharmaceutical / Biotech Sterile Fill-Finish / BSL-3/Pharmaceutical

Of course,we can Custom dimensions available to fit sandwich panel walls or concrete walls of any thickness.

OEM/ODM are welcome .amd we also can provide 2D/3D CAD Models drawing freely .

Flair pass boxes are widely used in contamination-controlled environments where materials must move safely between different cleanliness zones.

Typical industries include:

Pharmaceutical Manufacturing

Transfer of raw materials, intermediates, sterile components, packaging materials, and finished products while maintaining GMP compliance.

Biotechnology

Safe transfer of culture media, laboratory consumables, samples, and sterile equipment.

Semiconductor Manufacturing

Protection of wafers, precision components, and electronic assemblies from particulate contamination.

Medical Device Production

Contamination-controlled transfer during assembly, inspection, and packaging processes.

Hospitals and Healthcare

Movement of sterile supplies, surgical instruments, and pharmaceutical products between controlled environments.

Food and Beverage

Transfer of ingredients and packaging materials in hygienic production areas requiring strict contamination control.

Research Laboratories

Efficient movement of experimental materials while maintaining laboratory containment and cleanliness.

The interlocked doors prevent both doors from opening simultaneously, minimizing direct airflow between adjacent rooms. Dynamic pass boxes further reduce contamination by supplying HEPA-filtered air into the chamber before materials are transferred.

Most cleanroom pass boxes are manufactured from:

  • SUS304 stainless steel
  • SUS316L stainless steel
  • Powder-coated steel
  • Tempered safety glass viewing windows

Stainless steel is generally preferred because it is corrosion-resistant, easy to clean, and suitable for GMP environments.

Mechanical interlocks use purely mechanical components and require no electrical power. They are simple, reliable, and cost-effective. Electronic interlocks use electromagnetic locking systems, allowing integration with alarms, PLC controls, building management systems (BMS), and access control systems.

Need Help Selecting the Right Pass Box?

Share your cleanroom layout, wall opening or transfer requirements with our engineering team.

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