How Does A Pass Box Work?

A pass box is a device used in cleanroom environments to transfer items between two areas while maintaining the cleanliness and integrity of both spaces. Pass boxes typically consist of two chambers separated by a door or a sliding mechanism. The chambers are equipped with HEPA or ULPA filters to ensure the air inside remains clean and free of contaminants.

Here is how a pass box typically works:

1. Loading: Items or materials to be transferred are placed inside the pass box on one side (clean area) by an operator.

2. Entry: The operator closes the door or slides the mechanism to seal off the clean area from the outside environment. The pass through box door on the opposite side opens to allow access to the items inside.

3. Transfer: The operator from the other side (dirty area) can retrieve the items safely without compromising the cleanliness of the clean area. The pass box prevents contaminants and particles from entering the clean side by maintaining a differential pressure.

4. Unloading: After the items are removed, the door on the dirty side is closed, and the clean side door is opened to remove the items from the pass box.

Pass boxes are commonly used in pharmaceutical manufacturing, biotechnology research, electronics assembly, and other industries where cleanliness and control of contaminants are essential. They help maintain the integrity of sterile or controlled environments by allowing controlled transfer of materials between different areas without risking contamination.