The Biobase PB series consists of high-quality cleanroom transfer hatches, often referred to as pass boxes, which provide a “static” yet secure method for transporting items between rooms of different cleanliness levels. These boxes are constructed from durable SS 304 stainless steel and are equipped with a HEPA filter to maintain a sterile environment within the hatch. To prevent cross-contamination, the PB series utilizes a reliable electric interlock system that ensures the cleanroom-side door cannot be opened while the external door is accessible. Available in three different models to suit various laboratory, hospital, and industrial needs, these transfer hatches are paramount for maintaining pressure differentials and minimizing person-traffic through main cleanroom doors. Simple to install and easy to clean, the Biobase PB series is a staple for effective and safe material transportation in any controlled environment.