Pass Box

What is a pass box in a cleanroom?

A pass box in a cleanroom is a sealed container used to transfer materials between different controlled environments without compromising cleanliness. It typically features interlocking doors that prevent the simultaneous opening of both sides, minimizing the risk of contamination. Pass boxes are commonly used in industries such as pharmaceuticals, biotechnology, and electronics, where maintaining sterile conditions is critical.

These devices facilitate the safe and efficient movement of supplies, tools, or samples, ensuring that the cleanroom's integrity is maintained while allowing for necessary operations. They often include features like HEPA filters to further reduce the risk of airborne particles during transfers.

How does a pass box work?

A pass box operates by utilizing a dual-door system that prevents both doors from being opened at the same time, thereby maintaining the cleanroom's sterile environment. When materials need to be transferred, an operator places items inside the pass box and closes the door. Once the first door is securely shut, the second door can then be opened from the other side, allowing the recipient to access the items without direct exposure to the cleanroom.

Many pass boxes are equipped with additional features such as HEPA filters and UV sterilization to further enhance contamination control. These mechanisms work together to ensure that any airborne particles or pathogens are filtered out before the materials enter the cleanroom, thus preserving the integrity of the controlled environment.

What are the types of pass boxes?

Here are some common types of pass boxes used in cleanrooms and controlled environments:

• Standard Pass Box: Basic pass box with interlocking doors for material transfer.

• HEPA Filter Pass Box: Equipped with HEPA filters to minimize airborne contamination during transfers.

• UV Sterilization Pass Box: Includes UV light for disinfection of items before they enter the cleanroom.

• Electronic Pass Box: Features automated controls and monitoring systems for enhanced security and tracking.

• Vertical Pass Box: Designed for vertical transfer of materials, often used in applications where space is limited.

• Horizontal Pass Box: Standard design for horizontal transfer, commonly used in laboratory settings.

• Double-Sided Pass Box: Allows access from two separate cleanroom environments or areas.

• Custom Pass Box: Tailored designs to meet specific operational needs or industry requirements.

These various types of pass boxes help ensure effective contamination control while facilitating the safe transfer of materials in critical environments.

What is the difference between a static and dynamic pass box?

Differences Between Static and Dynamic Pass Boxes:

Airflow:

• Static Pass Box: No active airflow; relies on a sealed environment.

• Dynamic Pass Box: Active airflow with fans or blowers.

Filtration:

• Static Pass Box: Typically lacks advanced filtration systems.

• Dynamic Pass Box: Equipped with HEPA filters for enhanced air quality.

Operation:

• Static Pass Box: Manual operation; simple design.

• Dynamic Pass Box: Automated controls; more complex design.

Usage:

• Static Pass Box: Suitable for less critical applications.

• Dynamic Pass Box: Ideal for highly sensitive environments.

Contamination Control:

• Static Pass Box: Limited contamination control.

• Dynamic Pass Box: Enhanced contamination control measures.

How to install a pass box?

Installing a pass box involves several key steps to ensure proper functionality and compliance with cleanroom standards. First, select an appropriate location for the pass box, ideally near the entry point of the cleanroom to facilitate easy access while minimizing contamination risks. Ensure that the surrounding area is clean and meets the necessary specifications for installation.

Next, secure the pass box to the wall or surface using the provided mounting hardware. It’s crucial to follow the manufacturer’s guidelines for installation to maintain the integrity of the cleanroom environment. Ensure that the pass box is level and properly aligned to prevent any operational issues.

Finally, connect any electrical components if the pass box includes features like UV sterilization or automated controls. Once installed, conduct a thorough inspection and testing of the pass box to verify that it operates correctly and that there are no air leaks or contamination pathways. Regular maintenance checks should be scheduled to ensure ongoing performance and compliance with cleanroom protocols.

What materials are pass boxes made of?

Pass boxes are typically constructed from materials that ensure durability and ease of cleaning, with stainless steel being the most common choice. Stainless steel is favored for its corrosion resistance, non-porous surface, and ability to withstand frequent disinfection, making it ideal for maintaining cleanliness in controlled environments like cleanrooms.

In addition to stainless steel, some pass boxes may incorporate other materials such as tempered glass for visibility and inspection purposes, as well as high-grade plastics for lightweight designs. The choice of materials often depends on the specific requirements of the application, including the need for chemical resistance, thermal stability, and compliance with industry standards.

Why is a pass box used in cleanrooms?

A pass box is used in cleanrooms to facilitate the safe transfer of materials between different controlled environments while minimizing the risk of contamination. Its design, featuring interlocking doors and often advanced filtration systems, helps maintain the sterile conditions of the cleanroom by preventing the influx of airborne particles and pathogens during the transfer process, ensuring compliance with strict industry standards in sectors like pharmaceuticals, biotechnology, and electronics.

How to maintain and clean a pass box?

To maintain and clean a pass box, first, regularly inspect it for any signs of wear, damage, or contamination. For cleaning, use approved disinfectants suitable for the materials of the pass box, such as stainless steel, and follow a routine schedule to ensure all surfaces, including handles and seals, are thoroughly wiped down. Pay special attention to any filters, such as HEPA filters, and replace them according to manufacturer recommendations. Additionally, ensure that the pass box is properly sealed and operational after cleaning to maintain its effectiveness in preventing contamination in cleanroom environments.

What are the standard dimensions of a pass box?

The standard dimensions of cleanroom pass boxes can vary depending on their intended use and design. However, common sizes include:

• Small Pass Box:Dimensions: Approximately 600 mm x 600 mm x 600 mm (24 in x 24 in x 24 in)

• Medium Pass Box:Dimensions: Approximately 800 mm x 800 mm x 800 mm (32 in x 32 in x 32 in)

• Large Pass Box:Dimensions: Approximately 1000 mm x 1000 mm x 1000 mm (40 in x 40 in x 40 in)

• Vertical Pass Box:Dimensions: Approximately 600 mm x 600 mm x 1200 mm (24 in x 24 in x 48 in)

• Horizontal Pass Box:Dimensions: Approximately 1200 mm x 600 mm x 600 mm (48 in x 24 in x 24 in)

These dimensions can be customized based on specific requirements and the volume of items being transferred, as well as the layout of the cleanroom.