How to Install a Pass Box / Pass Through in a Cleanroom

Installing a Pass Box / Pass Through is an important step in maintaining controlled material transfer and ensuring cleanroom integrity. Proper installation helps prevent cross-contamination, maintain differential pressure, and support ISO 14644 cleanroom performance. Below is a standard installation guide covering the three most common mounting methods: wall-mounted, floor-mounted, and SUS stand-mounted.

1. Wall-Mounted Installation (Most Common)

A wall-mounted pass box is inserted directly into the partition wall between two rooms.

Installation Steps:

1. Prepare a wall opening according to the external dimensions of the pass box.

2. Insert the pass box into the opening, ensuring both sides are level and flush with the wall.

3. Secure the unit using mounting brackets, expansion anchors, or internal fixing plates.

4. Apply silicone sealant around all edges to ensure airtightness and pressure stability.

5. Test the door interlocks and confirm smooth operation before use.

Best For:
Pharmaceutical cleanrooms, semiconductor lines, electronics assembly, laboratories.

wall-mounted pass box

2. Floor-Mounted Installation (Heavy-Duty Transfer)

A floor-mounted pass box is installed directly on the cleanroom floor for large or heavy materials.

Installation Steps:

1. Position the pass box on the floor aligned with the wall cut-out.

2. Anchor the frame to the floor and the wall to ensure stability.

3. Seal all contact surfaces with cleanroom-grade silicone.

4. Adjust to ensure the transfer surface is level for carts and trolleys.

5. Verify door interlocks, viewing windows, and airflow (for dynamic models).

Best For:
Facilities transferring heavy equipment, trolleys, drums, bulk materials.

3. SUS Stand-Mounted Installation (Flexible & Modular)

When wall cutting is not possible, a pass box can be mounted on a custom stainless-steel (SUS304/316) stand.

Installation Steps:

1. Position the SUS stand on the floor and ensure it is level.

2. Fix the pass box securely onto the stand using bolts or welded support frames.

3. Align the working height with the operator’s workflow.

4. Seal around the rear side if connected to wall panels or modular partitions.

5. Test all functions, especially for dynamic pass boxes with HEPA airflow.

Best For:
Modular cleanrooms, renovation projects, rental cleanrooms, flexible installations.

Final Checks After Installation

• Ensure door interlocks work correctly.

• Confirm HEPA airflow, pressure, and recirculation (for dynamic pass boxes).

• Verify UV lamp, indicators, or buzzer functions if equipped.

• Perform leak-testing around edges and seams.

• Clean and sanitize before commissioning.