The Critical Gateway for Cleanrooms: An In-Depth Look at Pass-Through Windows

Created on 11.11
In the intricate ecosystem of a cleanroom, maintaining the designated cleanliness class is paramount. The improper transfer of items can introduce contaminants and compromise the entire environment. The Pass-Through Window, serving as the essential "gateway" between different cleanroom zones or between clean and non-clean areas, plays an indispensable role in preventing this.
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As a specialized manufacturer of stainless steel cleanroom furniture, SUN-YEE TECH deeply understands the critical function of the Pass-Through Window. We are committed to designing and manufacturing high-performance, reliable pass-throughs to ensure the integrity of your cleanroom processes.

1. What is a Pass-Through Window?

A Pass-Through Window, or Pass Box, is a chamber installed in the partition wall of a cleanroom. Its primary function is to allow the safe and efficient transfer of items (such as tools, materials, and samples) between two areas with different cleanliness levels, while minimizing cross-contamination of air between them.

2. Main Types of Pass-Through Windows

Based on their operating principles and control systems, pass-through windows are mainly categorized as follows:

Mechanical Interlock Pass-Through

  • Construction: This is the most basic model. Both doors are equipped with a mechanical interlocking device.
  • How It Works: The mechanical mechanism ensures that when one door is open, the opposite door is physically locked and cannot be opened. Only after one door is fully closed can the other be opened. This effectively prevents air convection caused by both doors being open simultaneously.
  • Ideal For:Areas where cleanliness requirements are not extremely critical, or as a cost-effective entry-level option.

Electronic Interlock Pass-Through

  • Construction: Utilizes electronic sensors and an electromagnetic lock system.
  • How It Works:Similar to the mechanical interlock but achieved through electronic control, offering higher reliability. It is typically equipped with indicator lights (Red/Green) and a buzzer to clearly display the status. It can also be integrated with your cleanroom management system.
  • Ideal For: The vast majority of cleanroom environments, such as pharmaceuticals, food processing, and electronics manufacturing.

Self-Purifying (Air Shower) Pass-Through

  • Construction: Built upon the electronic interlock model, it incorporates a High-Efficiency Particulate Air (HEPA) Filter and a blower fan. Optional UV-C lights are available for sterilization.
  • How It Works: After the door is closed, the fan automatically activates, drawing in air and forcing it through the HEPA filter. This creates a stream of clean, laminar airflow that purges the chamber of airborne particles rapidly. Models with UV lights can simultaneously provide surface disinfection.
  • Ideal For: Transfers between high-level clean zones (e.g., between Class 10,000 and Class 1,000) or areas with strict microbiological control requirements, such as sterile preparation rooms in hospitals and bio-labs.

3. Structure & Working Principle

A standard SUN-YEE TECH Pass-Through Window consists of the following core components:
  • Chassis: Constructed from high-quality 304 or 316 stainless steel, ensuring structural robustness, corrosion resistance, and easy cleaning. All welds and corners are smooth and rounded for a seamless, cGMP-compliant finish.
  • Doors: Typically feature a double-walled structure with sound and thermal insulation. High-quality sealing gaskets ensure excellent airtightness.
  • Interlock System: The precise mechanical or electronic interlock mechanism is the "security core" of the pass-through.
  • HEPA Filter: (Standard in Self-Purifying models) Offers a filtration efficiency of 99.99% on particles as small as 0.3 microns.
  • Control Panel: A user-friendly interface allows for setting purge cycle timers, controlling UV lights, and displaying operational status.

Standard Operating Procedure (for Self-Purifying Model):

Operator A (on side A) opens the door, places the item inside, and closes the door.
The sensor detects the closed door and automatically initiates the fan and UV light (if equipped).
The fan runs for a pre-set time (e.g., 15-30 seconds), purifying the chamber's interior.
Upon completion, the indicator light on side B turns green, signaling that it is safe to open.
Operator B (on side B) opens the door, retrieves the item, and closes the door. The transfer is complete with virtually zero air exchange between zones A and B.

4. Core Functions & Importance

  • Air Lock Function: Minimizes airflow exchange between different cleanliness zones, maintaining stable pressure differentials.
  • Reduces Door Openings:  Eliminates the contamination risk associated with frequent personnel entry and exit.
  • Material Buffer: Serves as a temporary storage and decontamination space for items.
  • Process Control: Enforces standardized operating procedures through mandatory interlock and purge cycles.

5. How to Order Your Professional Pass-Through from SUN-YEE TECH

At SUN-YEE TECH, we know every cleanroom is unique. That's why we offer flexible solutions that combine standard features with customizability.

Our ordering process is simple and transparent:

Consultation & Needs Analysis: Contact us via email, phone, or our website to discuss your requirements, including:
  • Application (Electronics, Pharma, Food, etc.)
  • Required Cleanliness Class
  • Desired Type (Mechanical/Electronic/Self-Purifying/with UV)
  • Installation Dimensions (Opening size, wall thickness)
  • Special Requirements (e.g., view window, trolley docking height, special materials)

Proposal & Quotation:

 Our technical team will recommend the most suitable product model, provide technical drawings, and a competitive factory-direct price quote.

Confirmation & Production:

 Upon your approval, we begin lean manufacturing using premium materials and strict quality control, ensuring every unit meets the high SUN-YEE TECH standard.

Quality Assurance & On-Time Delivery:

 Every unit undergoes rigorous performance testing (leak test, interlock function test, cleanliness verification). We guarantee on-time delivery to keep your project on schedule.

After-Sales Support:

 We provide comprehensive technical support and after-sales service for your complete peace of mind.

Take Action Now!

If you are looking for a reliable and efficient pass-through window solution for your cleanroom, SUN-YEE TECH is your trusted partner. We offer professional expertise, dependable quality, and competitive pricing to protect your critical environment.
Contact us today for a free product catalog and professional consultation!
[sales@sun-yee.com]
[www.sun-yee.com]
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