In an Electronic Cleanroom, the gray zone, as a special area, plays a crucial role. It not only physically connects the clean area with the non-clean area, but also functionally plays the role of buffer, transition and protection.

Purification engineering specially designed room, regardless of how the external air conditions change, the room has to maintain the original set requirements of cleanliness, temperature and humidity, and pressure and other properties.

Modern technology development has made semiconductor manufacturing essential for advancing electronics industry development. Cheapest and smallest particles encountered during the manufacturing stage have the power to damage both the functionality of chips and their manufacturing outcomes. Cleanrooms have now established themselves as critical components for every semiconductor production facility.

As a kind of auxiliary equipment of Clean Room, Pass Box is mainly used for transferring small items between clean area and clean area, non-clean area and clean area, in order to reduce the number of times of opening the door of Clean Room and minimize the pollution of clean area. Transfer window is widely used in micro-technology, biological laboratories, pharmaceutical factories, hospitals, food processing industry, LCD, electronic factories and so on all the places that need air purification.