Industrial Pass Box

An Industrial Pass Box—also called a pass-through chamber or hatch—is a wall-mounted, enclosed transfer unit used to move materials between two rooms while limiting airflow, particle transfer, and cross-contamination. It is common in cleanrooms, pharmaceutical plants, laboratories, hospitals, food processing, and electronics manufacturing.

How Industrial Pass Box works

A pass box is installed through a wall separating areas of different cleanliness levels. It has two doors—one on each side—with an interlock so only one door can open at a time, preventing direct air exchange between the rooms.

1. Load the item into the chamber from the less-controlled side.

2. Close and lock that door.

3. In a dynamic unit, filtered air or UV-C treatment may run.

4. Open the opposite door and retrieve the item in the cleaner area.

5. Typical Specifications

   • Construction: Stainless steel, commonly SS 304; some use powder-coated CRCA steel.

   • Doors: Opposing doors with glass viewing panels and mechanical, magnetic, or microprocessor-based interlocks.

   • Filtration: Dynamic models may use HEPA filters, commonly H13 or H14.

   • Common sizes: Roughly 300 × 300 mm up to 1,000 × 1,000 mm, with working sizes often around 400 × 400 × 400 mm or 2 × 2 × 2 ft.

   • Optional features: UV-C germicidal lamps, alarms, digital controls, pressure indicators, and removable interior shelves/grids.