latest company case about Guangzhou Cleanroom Construction Co., Ltd. Certifications

In pharmaceutical GMP workshops, biological laboratories, semiconductor cleanrooms, and food processing production lines, the pass box is a critical device for isolating areas with different cleanliness levels. It is not merely a physical channel, but a core barrier for controlling cross-contamination and maintaining stable pressure differentials.

As a professional pass box manufacturer, we provide more than just equipment. We deliver a one-stop clean transfer solution — from model selection calculations and non-standard customization to validation and final delivery.

Based on different industry applications, this article explains how precise equipment selection and customization can achieve the balance between compliance and operational efficiency.

I. The First Step in Selection: Determining Core Parameters Based on Industry Requirements

Different industries follow entirely different contamination control logics. If the selection is incorrect, even high-quality equipment may fail GMP or ISO certification. The first step in procurement must be parameter confirmation based on actual operating conditions.

1. Cleanliness Classification & Filter Selection

• Electronics / Semiconductor Industry
  This industry imposes extremely strict control over particles ≥0.3μm. We recommend configuring an H14 HEPA filter (filtration efficiency ≥99.999%) and ensuring equipment leakage rate ≤0.01%. The cabinet is typically constructed from 1.5mm thick SUS304 stainless steel to withstand high-frequency use and prevent deformation.

• Sterile Pharmaceutical Production / Biological Laboratories
  The focus is on microbial control. In addition to HEPA filtration, UV sterilization lamps (commonly 8W or 30W) must be installed, and irradiation intensity and sterilization duration (typically 15–30 minutes) must be validated.

• Food Processing / General Mechanical Manufacturing
  The main objective is preventing insects and dust intrusion. An H13 HEPA filter with basic interlocking functions is generally sufficient, balancing performance and procurement cost.

2. Interlock Logic Selection

• Mechanical Interlock
  Simple structure and high reliability. Suitable for general clean areas without electronic system integration requirements.

• Electronic Interlock / PLC Control
  Ideal for frequently linked production lines. For example, in conveyor-type pass boxes, PLC control can synchronize lifting doors with conveyor systems, enabling uninterrupted material transfer and eliminating manual waiting time.

II. Customization Capability: When Standard Models Cannot Meet Production Needs

The standard 600×600×600mm pass box is only suitable for small item transfer. In modern industrial production, material forms vary significantly, making customization essential.

1. Conveyor-Type Pass Box (Integrated with Production Lines)

When materials are heavy or need to be integrated into automated lines, conventional pass boxes are insufficient. A professional manufacturer can provide conveyor-type pass boxes featuring:

• Structure: Roller or belt conveyor embedded beneath the chamber, sealed enclosure above.

• Process Flow: Material entry → Front lifting door opens → Material transferred inside → UV sterilization → Rear lifting door opens → Material exits.

• Customization Requirements: Provide material weight (to determine motor power), conveyor length (to determine workstation integration), and loading/unloading height.

2. Large-Size & Special-Shaped Customization

For automotive manufacturing or large mechanical components, oversized pass boxes (≥1500mm width) are required. Key considerations include:

• Load-Bearing Structure: Reinforced stainless steel base plate or support ribs to prevent deformation under heavy loads.

• Door Type: Sliding doors are recommended for large units to avoid operational space limitations caused by traditional swing doors.

3. Special Process Optimization

• Self-Cleaning / Air Shower Function:
  For high cleanliness requirements, vertical laminar airflow (0.45–0.75 m/s) can be integrated to provide air washing of material surfaces.

• Differential Pressure Monitoring:
  Installation of electronic pressure gauges allows real-time monitoring and data traceability of internal and external pressure differences.

III. Why Choose a One-Stop Solution?

Purchasing a pass box is not simply buying equipment — it is part of an integrated cleanroom system. Selecting a manufacturer capable of handling the full process from selection to installation significantly reduces project risk.

1. Avoid Interface Conflicts

Many projects discover incorrect wall openings only after renovation completion. A one-stop service requires manufacturer engineers to conduct early site inspections:

• Confirm wall material and thickness (sandwich panel or brick wall) to match chamber depth.

• Confirm electrical layout (220V/50Hz power supply, accurate load calculation).

• Confirm integration with adjacent equipment such as air showers or clean booths.

2. Transparency in Materials & Craftsmanship

High-quality customization is reflected in details:

• Cabinet Material: Clearly specify whether SUS201 or SUS304 stainless steel is used. Medical and food-grade environments require SUS304 with thickness not less than 1.0mm.

• Internal Finishing: Rounded internal corners eliminate dead zones, prevent dust accumulation, and facilitate cleaning — a key detail for GMP inspection compliance.

3. Validation & After-Sales Service

The final step of a one-stop solution is proper commissioning and long-term support:

• Factory Testing: Provide PAO aerosol leak testing reports and filter efficiency reports.

• On-Site Commissioning: Professional engineers test interlock logic, sterilization timing, and airflow velocity.

• After-Sales Support: Provide spare parts for key components such as conveyor motors and control boards, with 24-hour emergency response mechanisms.

IV. Conclusion

Choosing a professional pass box manufacturer means choosing a technical partner.

From a simple selection sheet to a fully customized unit seamlessly integrated into your cleanroom, we ensure zero-contamination material transfer through:

• Data-driven parameter matching (e.g., 99.999% filtration efficiency)

• Precision mechanical design (e.g., conveyor load capacity calculation)

• Strict material and fabrication standards (e.g., SUS304 rounded chamber construction)

If you are planning a new cleanroom or concerned about cross-contamination risks in your existing pass box system, provide your material dimensions, cleanliness classification, and site conditions. We will deliver a tailored technical proposal and accurate quotation.