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What is a Stainless Steel Air Shower Pass Box

Created on 2025.04.11
The Stainless Steel Air Shower Pass Box is a specialized cleanroom device that integrates the functions of an air shower and a traditional pass-through window. It is designed to remove surface dust and perform sterilization during material transfer between areas of different cleanliness grades, thereby ensuring an aseptic and particle-controlled transfer process.
Industrial machine with glowing light inside, safety sign nearby.

1. Main Structure and Components

A stainless steel air shower pass box typically consists of the following core components:
  • Stainless steel enclosure
Manufactured from 304 or 316 stainless steel, offering excellent corrosion resistance and easy cleaning.
  • HEPA filtration system
Effectively removes airborne particles ≥0.3 μm to provide clean, filtered airflow.
  • Air shower nozzles
Deliver high-velocity clean airflow to dislodge dust and contaminants from item surfaces.
  • Interlocking door system
Prevents both doors from opening simultaneously, maintaining strict separation between clean and non-clean areas.
  • Control panel
Allows adjustment of air shower duration, airflow speed, and operational settings.
  • Optional configurations
Including UV sterilization lamps, PLC intelligent control systems, and pressure differential monitoring.

2. Working Principle

The stainless steel air shower pass box operates through a controlled and sequential process:
  1. Item placement
The operator places materials inside the pass box from the non-clean side.
  1. Air shower activation
Once the outer door is closed, the air shower system is activated either automatically or manually. HEPA-filtered air is discharged at high speed (typically 20–25 m/s), effectively removing dust and particles from the surface of the items.
  1. Clean-side transfer
After the air shower cycle is completed, the clean-side door unlocks, allowing safe retrieval of the items into the clean area.

3. Core Functions

  • Efficient dust removal
High-speed HEPA-filtered airflow removes surface contaminants such as dust and fibers.
  • Prevention of cross-contamination
The interlocking door mechanism eliminates direct airflow between areas of different cleanliness levels.
  • Optional sterilization capability
UV lamps can be integrated to provide additional surface disinfection.
  • Compliance with cleanroom standards
Designed to meet GMP, ISO 14644, and other relevant cleanroom requirements.

4. Typical Applications

Stainless steel air shower pass boxes are widely used in industries requiring strict contamination control, including:
  • Pharmaceutical industry
Aseptic manufacturing zones and raw material transfer
  • Electronics manufacturing
Transfer of semiconductors and precision components
  • Food processing industry
Movement of packaging materials and production tools
  • Laboratories
Biological samples and laboratory equipment transfer
  • Hospitals
Transfer of surgical instruments and pharmaceutical supplies

5. Differences Compared to a Standard Pass Box

Feature
Standard Stainless Steel Pass Box
Stainless Steel Air Shower Pass Box
Primary function
Basic isolation transfer
Transfer with active dust removal
Airflow system
None
HEPA filtration with high-speed airflow
Cleanliness performance
Passive isolation
Active surface particle removal
Suitable environment
General clean areas
High-cleanliness cleanrooms (Class 100 / 1000)
Cost
Lower
Higher

6. Key Considerations for Selection

When selecting a stainless steel air shower pass box, the following factors should be carefully evaluated:
  • Cleanliness requirement
Select appropriate HEPA grades such as H13 or H14 based on cleanliness classification.
  • Air shower duration
Typically adjustable between 10–30 seconds to achieve optimal cleaning performance.
  • Internal chamber size
Should match the dimensions and volume of transferred materials.
  • Material selection
304 stainless steel for general applications or 316 stainless steel for corrosive environments.
  • Additional functions
Options such as UV sterilization, pressure display, or touchscreen control can be selected as needed.

Summary

Compared with standard pass boxes, the stainless steel air shower pass box provides superior performance in high-cleanliness environments such as pharmaceutical plants, electronics cleanrooms, and biological laboratories. By combining isolation and active surface cleaning, it ensures a dust-free and sterile material transfer process, significantly reducing contamination risks and supporting compliance with cleanroom standards.
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