The Stainless Steel Air Shower Pass Box is a cleanroom equipment that combines the functions of an air shower and a pass-through window. It is primarily used to efficiently remove dust and sterilize the surfaces of items when transferring them between areas of different cleanliness levels, ensuring an aseptic and dust-free transfer process.
1. Main Structure and Components
A stainless steel air shower pass box typically consists of the following core parts:
Stainless steel enclosure (304 or 316 stainless steel, corrosion-resistant and easy to clean)
HEPA filter (removes particles ≥0.3μm, purifies air)
Air shower nozzles (high-speed clean airflow to blow off surface contaminants)
Interlocking door system (prevents both doors from opening simultaneously, ensuring isolation of the clean area)
Control panel (adjusts air shower duration, airflow speed, etc.)
Optional features (UV sterilization, PLC smart control, pressure differential monitoring, etc.)
2. Working Principle
Place items inside: The operator places the items into the non-clean side of the pass box.
Activate air shower: After closing the outer door, the air shower system is activated automatically or manually. High-speed purified airflow (20-25 m/s) filtered by HEPA blows out to remove dust and particles from the item surfaces.
Transfer to the clean area: After the air shower cycle ends, the inner door on the clean side can be opened to retrieve the items.
3. Core Functions
✅ Efficient dust removal: High-speed HEPA-filtered airflow blows away surface particles (e.g., dust, fibers).
✅ Prevents cross-contamination: Interlocking doors ensure no direct airflow between clean and non-clean areas.
✅ Optional sterilization: Some models include UV lamps for surface disinfection.
✅ Complies with cleanroom standards: Meets GMP, ISO 14644, and other cleanroom regulations.
4. Applications
Pharmaceutical industry: Aseptic production areas, raw material transfer
Electronics manufacturing: Transfer of chips, precision components
Food industry: Packaging materials, production tool transfer
Laboratories: Biological samples, lab equipment transfer
Hospitals: Surgical instruments, medicine transfer
5. Differences from a Standard Pass Box
| Comparison | Standard Stainless Steel Pass Box | Stainless Steel Air Shower Pass Box |
| Primary function | Basic item transfer with isolation | Transfer + air shower dust removal |
| Airflow control | No air shower system | Equipped with HEPA filtration and high-speed airflow |
| Cleanliness effect | Only isolates, no active cleaning | Actively removes surface particles |
| Suitable environment | General cleanliness requirements | High-cleanliness environments (e.g., Class 100/1000 cleanrooms) |
| Cost | Lower | Higher |
6. Key Considerations for Selection
Cleanliness level: Choose HEPA filter grade (e.g., H13/H14) based on requirements.
Air shower duration: Typically adjustable between 10-30 seconds for optimal dust removal.
Size: Select an appropriate internal chamber size based on the items being transferred.
Material: 304 stainless steel (general use) or 316 stainless steel (corrosion-resistant for harsh environments).
Additional features: Decide if UV sterilization, pressure display, touchscreen control, etc., are needed.
Summary
The stainless steel air shower pass box offers superior performance in high-cleanliness environments (e.g., pharmaceuticals, electronics, and biolabs) compared to standard pass boxes. It not only isolates contamination but also actively cleans item surfaces, ensuring a dust-free and sterile transfer process.