What is an important element incorporated in a vestibule?

A vestibule serves a crucial function in building design, particularly concerning the control of airflow. This transitional space acts as a buffer zone between the outdoors and the interior of a building. By minimizing the direct exchange of cold or hot air, vestibules help maintain the building's internal climate, which enhances energy efficiency. This is especially important in climates with extreme temperatures, as it reduces the workload on heating and cooling systems.

In addition to energy conservation, vestibules also help prevent drafts and reduce noise from outside, contributing to overall comfort within the building. While elements such as storage space, emergency exits, and security checkpoints may be relevant in some design contexts, they are not the primary focus of a vestibule's function. Instead, the specific design goal of a vestibule emphasizes the control of airflow to improve thermal comfort and energy management.