In vestibule ventilation for smoke control systems, each vestibule must have a minimum net area of _____ sq ft of opening in a wall facing an outer court, yard or public way that is not less than 20 ft in width.

In vestibule ventilation for smoke control systems, ensuring that each vestibule has an adequate net area of openings is critical for effective smoke management, especially during emergency situations such as a fire. A net area of 16 square feet is specified as the minimum for openings in a wall facing an outer court, yard, or public way that is not less than 20 feet wide.

This requirement is based on the need for sufficient airflow to allow smoke to escape from the vestibule, thereby enhancing the overall safety of the building and its occupants. The adequate net area helps in creating an effective path for smoke to vent outside, which is essential in controlling smoke movement and reducing the risk of smoke inhalation for individuals inside the building. The focus on the outer court, yard, or public way ensures that there is a clear and unobstructed route for smoke dissipation.

Other values presented in the options, while closer to the requirement than some others, do not meet the specified criteria for optimizing smoke control in vestibules according to established safety standards and codes. Therefore, selecting 16 square feet appropriately meets the guidelines for effective smoke control ventilation in commercial buildings.