Pass Boxes — Static & Dynamic Pass Box for Cleanroom Material Transfer
Pass Boxes — Static and Dynamic Pass Box for Material Transfer
Pass boxes are essential transfer devices used to move materials between cleanrooms or between controlled and non-controlled environments. They help maintain cleanliness levels, minimize particle contamination and avoid unnecessary personnel movement. With proper selection and installation, pass boxes can significantly improve workflow efficiency and reduce air handling loads in pharmaceutical, semiconductor, biotech and optical manufacturing facilities.
Farclean manufactures both Static Pass Boxes and Dynamic Pass Boxes with stainless steel structures, airtight sealing, HEPA filtration options and advanced interlock systems that meet ISO 14644 and GMP requirements.
What Is a Cleanroom Pass Box?
A cleanroom pass box is a specialized chamber mounted within a cleanroom wall to transfer materials between different cleanliness classifications. The main purpose is to prevent contamination, maintain differential pressure and reduce air loss between rooms. Pass boxes are available in multiple configurations based on cleanliness grade, transfer frequency and hygiene standards required by the production process.
Typical uses include:
- Transferring raw materials, tools and semi-finished products
- Moving samples, chemicals or small equipment
- Delivering packaging materials or containers
- Preventing cross-contamination between cleanroom zones
Static Pass Box
Static Pass Boxes are installed between rooms with similar or equal cleanliness levels. They do not contain fans or HEPA filtration systems and rely solely on interlocked doors to maintain isolation. Static pass boxes are widely used in laboratories, packaging rooms, food processing areas and low-risk clean environments.
Main Features:
- Durable stainless steel SUS304/SUS316 internal chamber
- Mechanical or electromagnetic interlock system
- Tempered glass window for easy observation
- Smooth rounded corners designed for effortless cleaning
- Optional UV lamp for sterilization
Advantages:
- Lower investment cost
- Simple structure, easy maintenance
- No additional power consumption
Dynamic Pass Box
Dynamic Pass Boxes are equipped with a built-in HEPA/ULPA filtration system and operate with positive pressure airflow. These pass boxes are used when transferring materials from lower-grade areas to higher-grade cleanrooms. They function like a mini air-cleaning chamber, removing dust and particles before opening into the cleaner zone.
Main Features:
- High-efficiency HEPA H13/H14 or ULPA filters
- EC fan motor providing stable laminar airflow
- Digital display for pressure and operating status
- Electromagnetic interlock for door safety
- Optional PLC touchscreen control system
Advantages:
- Ensures material cleanliness upon transfer
- Improves GMP compliance
- Maintains pressure and prevents backflow contamination
Static vs. Dynamic Pass Box — Detailed Comparison
| Category | Static Pass Box | Dynamic Pass Box |
|---|---|---|
| Airflow | No fan or filter | HEPA/ULPA filtered laminar airflow |
| Cleanliness Control | Basic contamination control | High-level contamination reduction |
| Best Application | ISO 7–8 environments | ISO 5–7, GMP Grade B/C zones |
| Installation | Minimal construction requirement | Requires power supply & airflow design |
| Cost | More economical | Higher investment |
Product Advantages
- High-strength stainless steel structure with long service life
- Professional cleanroom-grade sealing and hinges
- Easy installation in modular and traditional cleanrooms
- Multiple sizes available for small to large material transfer
- Fully customizable dimensions, interlocks, filtration and automation
Industry Applications
- Pharmaceutical & API manufacturing facilities
- Biological safety and microbiology laboratories
- Semiconductor wafer fabs and microelectronics plants
- Medical device and surgical equipment factories
- Optical lens, display and precision assembly cleanrooms
- Food, cosmetics and nutraceutical production
How to Select the Right Pass Box for Your Facility
Choosing the correct pass box depends on several factors:
- Cleanliness grade difference between connected rooms
- Required airflow and particle reduction level
- Material type, size and transfer frequency
- Regulatory requirements such as GMP, ISO 14644 and FDA
- Budget considerations and maintenance preferences
For high-grade cleanrooms, a dynamic pass box is strongly recommended to ensure contamination-free material movement.
Why Choose Farclean Pass Boxes?
- Strong engineering capability and professional cleanroom experience
- Manufacturing in China with strict quality control
- Custom-built pass boxes to match project drawings
- Fast production and export-ready packaging
- Complete cleanroom equipment supply including FFUs, air showers, clean benches and stainless-steel furniture
Conclusion
Pass boxes are indispensable for maintaining cleanroom integrity and protecting product quality. Farclean offers a full range of static and dynamic pass boxes designed for different industries and cleanliness classes. With flexible customization and strict quality standards, we help customers build safer and more efficient production environments.
Contact us for product specifications, drawings and pricing for your upcoming cleanroom project.
