entry cubicles en

Structures housing entry doors that are attached to the main door to form an interlocking system of two sets of doors, or occasionally revolving doors, such as in churches, theaters, banks, clean rooms in laboratories, ships, etc. In secure systems, it is required that the exterior door is closed before the interior door is opened. Even if this security measure is not employed (such as in a church), the system serves to protect the interior from outside weather, light, and noise. It differs from a vestibule in that a vestibule is part of the floor plan, designed as integral to and attached to the architecture, while an entry cubicle is primarily separate and attached to the architectural entrance.