Pass Box (also known as a Pass Through, Pass-Through Chamber, or Transfer Hatch) is a specialized cleanroom device designed to safely transfer materials between two controlled environments ,between the same cleanliness level or lower level to higher level cleanroom while preventing cross-contamination. It maintains the cleanliness level, airflow stability, and pressure balance according to ISO 14644–compliant.
With over 18 years of manufacturing excellence, Flair provides more than just hardware; we provide integrated solutions that safeguard your controlled environment.
Featuring a radius-corner interior design to eliminate dead zones and ensure effortless, thorough cleaning
Maintaining stringent pressure gradients with optimized airtight design for GMP-regulated facilities.
Dynamic with SUS air nozzles,LAF air with diffuser.
Advanced access management for maintaining critical environmental stability.
Optional UV-C lamp can be built-in
Based on the ISO 14644–14 guidance, equipments are designed for cleanrooms
Flair is Your Reliable Cleanroom Pass through manufacturer
We recognize that no two cleanrooms are identical. We offer a tailored manufacturing process to meet your specific project requirements.
Step 1: Select Your Pass Box Type(static/dynamic/LAF )
Step 2: Define Your material&Dimensions
(External/inernal dimension)
Step 3:Configure Your Interlock & Control (electronic/mechanical/Optional BMS)
Step 4: Add Advanced Features
UV-C germicidal lamps/interphone/alarming buzzer/ramp)
Contact us soon for your pass box!
With other names such as cleanroom pass through, clean transfer window and transfer hatch; it is widely used in microbiology laboratories , food, pharmaceutical , electronics and semiconductor cleanrooms.
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.
1.How to install pass boxes?
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)
What’s more,Proper installation ensures the pass box functions as intended, maintaining the integrity, safety, and cleanliness of the adjoining spaces.
2. Pass box classifications
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.
3. Dynamic pass box working principle
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
4.LAF pass box VS Dynamic pass box
LAF Pass box
with undirectional airflow from diffuser into the side
Dynamic pass box
The airflow is through built-in air nozzles.
Static Pass Box VS Dynamic Pass Box VS Laminar Flow (LAF)Pass box
| 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 |
Can Flair tailor the pass box according to designeror EPC request ?
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 .
