What device must be provided to secure a door when it is closed?

To ensure fire safety and compliance with relevant codes, both single fire doors and pairs of side-hinged swinging fire doors must be equipped with devices that secure them when closed.

Single fire doors are designed to prevent the spread of fire and smoke between different areas of a building. These doors need an adequate closing mechanism, such as an automatic self-closing device or a latch, to maintain their integrity during a fire event.

In the case of pairs of side-hinged swinging fire doors, it is essential for both doors to have proper latching mechanisms so that when they are closed, they create a secure barrier against fire and smoke. This ensures that both leaves of the door assembly work together effectively to protect life and property in the event of a fire emergency.

Therefore, it's crucial to provide securing devices for both types of doors to meet safety standards, making the combined requirement of both single fire doors and pairs of side-hinged swinging fire doors correct.