Pass boxes are a component of a cleanroom system that allows for transfer of items between two areas of differing cleanliness, These two areas can be two separate cleanrooms or a non-clean area and a cleanroom, Utilizing pass boxes decreases the amount of traffic in and out of the cleanroom. which saves energy and lowers risk of contamination. Pass boxes are often seen in sterile laboratories, electronics manufacturing. hospitals, pharmaceutical manufacturing facilities, food and beverage production facilities, and many other clean manufacturing and research environments.