SS Pass Box

Static pass box is auxiliary equipment in cleanrooms, which allows materials to be transferred into cleanroom without actual personnel movement. It can not only keep the items clean but also work as an airlock to prevent air. Table of contents. Static pass box definition.A pass box, which is also called a transfer hatch or SAS pass (sterile access system), works as a barrier between areas with different levels of cleanliness when materials do have to be moved. The equipment is used to transfer material from an area of lower cleanliness to an area of higher cleanliness, and vice versa.Static pass boxes are used to transfer materials between two rooms of equal cleanliness levels and are designed for minimal personnel movement while dynamic pass boxes are used to transfer materials from uncontrolled to controlled environments.