Krew Instrument, based in India, is a reputable manufacturer of static pass boxes. These boxes are commonly used in the pharmaceutical industry for transferring materials while maintaining the cleanroom classification between two areas. The pass box serves as a barrier between two different areas and prevents air from flowing between them during material transfer. The static pass enclosure typically consists of a simple box placed between the two areas. This type of pass box is also referred to as a passive cleanroom passbox and helps to keep pollutants out of the sterile region. In summary, the static pass box is designed to hinder the flow of air between two areas during material transfer and is a passive means of preventing contaminants from entering the sterile area.