The clean room pass box is a specialist transfer enclosure constructed from stainless steel and installed within the walls of clean room facilities to enable the safe passage of materials between areas of different cleanliness classifications, including transfers between non-clean and clean zones or between distinct ISO class environments. The unit features two interlocked doors that cannot be opened simultaneously, ensuring that a complete seal is maintained between adjacent environments at all times and preventing the transfer of contaminants during the handover process.

By facilitating material transfers without requiring personnel to physically move between zones, the pass box significantly reduces the risk of contamination introduction and supports compliance with clean room operational protocols. The stainless steel construction provides a hygienic, durable, and easily cleanable surface, making it suitable for use in pharmaceutical, biotechnology, semiconductor, and other industries where clean room integrity is paramount.