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  • Enclosed pass-throughs designed for contamination-free passage of personnel into a clean room. These pass-throughs typically consist of a metallic and/or plastic structure with two opposite or right-angle-located doors. Personnel pass-through cabinets usually include a high-efficiency particulate-air (HEPA) filter; they may also include an automated air shower, which is actuated upon entry and permits opening of the exit door only after a predetermined time of functioning, and a door interlock. After the air shower finishes, the air is exhausted to the outer side (i.e., the dirty room), and the person is free to enter the clean room. Most personnel clean room pass-throughs are also used to transfer materials into and out of the clean room, frequently in wheeled devices (e.g., carts).
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