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Double Layer Pass Box: Ensuring Clean and Controlled Environment

Cleanrooms are used extensively in industries such as pharmaceuticals, electronics, healthcare, and research, where maintaining a contaminant-free environment is essential. Double layer pass boxes play a pivotal role in facilitating the transfer of materials and samples between different areas of a cleanroom while minimizing the risk of contamination.

What is a Double Layer Pass Box?

A double layer pass box is a specialized equipment designed to allow the transfer of items into and out of a cleanroom environment while maintaining the integrity of the controlled atmosphere. It consists of two chambers with interlocked doors, ensuring that only one door can be opened at a time, preventing simultaneous access from both sides. This controlled access mechanism helps maintain a clean and controlled environment within the cleanroom.

Purpose and Function

The primary purpose of a double layer pass box is to provide a secure and controlled transfer point for materials, samples, or equipment between cleanrooms or between cleanrooms and non-cleanroom areas. By minimizing human movement and maintaining proper containment, these pass boxes significantly reduce the risk of contamination during transfer operations.

Benefits and Features

Double layer pass boxes offer several benefits and features that make them invaluable in cleanroom environments. They provide an airtight seal when both doors are closed, ensuring that the controlled atmosphere is not compromised. The interlocked doors prevent cross-contamination and the introduction of pollutants into the cleanroom. Some pass boxes are equipped with high-efficiency particulate air (HEPA) filters, further enhancing the air quality during transfer operations.

These pass boxes are also designed with materials that are resistant to chemicals and easy to clean, ensuring proper maintenance and preventing the accumulation of contaminants. Additionally, they can be customized to include features such as ultraviolet (UV) germicidal lamps or electronic interlocks for enhanced sterilization and security.

How Does a Double Layer Pass Box Work?

Double layer pass boxes employ a simple yet effective mechanism to ensure controlled access. When one door is opened, the other door automatically locks, preventing both doors from being open simultaneously. This interlocking feature maintains the integrity of the cleanroom environment by allowing only one door to be open at any given time.

The doors of a double layer pass box are made of materials such as stainless steel or glass, which are easy to clean and resistant to contamination. Some pass boxes are also equipped with a door-in-door design, enabling the transfer of smaller items without compromising the controlled environment.

Types of Double Layer Pass Boxes

Double layer pass boxes are available in different configurations to suit various cleanroom requirements. Some common types include:

Wall-Mounted Pass Boxes

Wall-mounted pass boxes are designed to be installed directly into the cleanroom walls. These pass boxes provide a seamless integration with the cleanroom structure, saving valuable space and ensuring a smooth flow of materials and samples.

Floor-Mounted Pass Boxes

Floor-mounted pass boxes are standalone units that are placed on the cleanroom floor. They offer flexibility in terms of positioning and can be easily relocated or reconfigured according to changing cleanroom layouts.

Other Variations

In addition to wall-mounted and floor-mounted pass boxes, there are other variations available, such as pass boxes with air showers or pass boxes with built-in sterilization systems. These variations cater to specific cleanroom requirements and provide additional features for enhanced contamination control.

Installation and Maintenance Considerations

Proper installation and maintenance of double layer pass boxes are essential to ensure their optimal performance and longevity. Consider the following considerations:

Proper Placement and Configuration

Double layer pass boxes should be strategically placed within the cleanroom to minimize traffic and maintain an efficient workflow. The configuration of the pass boxes should be carefully planned to avoid any obstructions and provide easy access for personnel.

Cleaning and Sterilization

Regular cleaning and sterilization of double layer pass boxes are crucial to prevent the buildup of contaminants. It is recommended to follow the manufacturer's guidelines for cleaning procedures and intervals. The use of appropriate disinfectants and cleaning agents is important to maintain the pass boxes' cleanliness and prevent the spread of contaminants.

Applications of Double Layer Pass Boxes

Double layer pass boxes find applications in various industries where cleanroom environments are essential. Some key sectors that benefit from these pass boxes include:

Pharmaceutical Industry

In pharmaceutical manufacturing, double layer pass boxes are used for transferring raw materials, samples, and finished products within different stages of the production process. They help prevent cross-contamination and maintain the sterility of the drugs, ensuring product integrity and safety.

Electronics Industry

The electronics industry relies on cleanroom environments to produce sensitive electronic components. Double layer pass boxes play a vital role in the transfer of components and equipment, safeguarding them against contaminants that could impact their functionality.

Medical Institutions

Hospitals, clinics, and research laboratories utilize cleanrooms to maintain a sterile environment for surgeries, medical procedures, and research activities. Double layer pass boxes enable the safe transfer of medical instruments, samples, and other materials, minimizing the risk of infections and cross-contamination.

Research Laboratories

Research laboratories, particularly those involved in microbiology, genetics, or nanotechnology, depend on cleanroom environments to conduct experiments. Double layer pass boxes facilitate the transfer of sensitive samples, ensuring the integrity and purity of the research.

Choosing the Right Double Layer Pass Box

When selecting a double layer pass box for a cleanroom environment, several factors should be considered. These include the specific requirements of the cleanroom, the size and weight of the materials to be transferred, the level of sterility needed, and any additional features or customization options required. Consulting with a reputable supplier or manufacturer is advisable to ensure the chosen pass box meets the desired specifications.


Double layer pass boxes play a vital role in ensuring a clean and controlled environment in various industries. By providing a secure transfer point, they contribute to contamination control, minimize the risk of cross-contamination, and safeguard the integrity of the cleanroom environment. Proper installation, maintenance, and selection of the right pass box are essential to maximize their effectiveness and longevity.

Kwang Purification is proud to offer examples of a variety of our cleanroom Pass Box below.  Hospital Pass Box,  Cleanroom Pass Box,  Clean Room Pass ThroughAir Shower Pass BoxMedical Pass BoxPass Box ManufacturerPass Box Price.

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