Pass Through Doors are specially constructed doors with four different opening choices that help to produce a sterile and controlled atmosphere. These doors aid in airflow control as they transition between the sterile compartment and the outside environment.

Controlled access doors function by providing one-way or two-way airflow, limiting air leaks during the sterilization process and maintaining the sterile environment's integrity. Furthermore, these doors allow for easy and regulated access for staff entering and exiting the sterile area, assuring a safe and controlled transit. The usage of controlled access doors improves sterilizing efficacy while lowering the danger of infection.