Which device assists in ensuring a fire door is closed after use?

The selection of a self-closing device as the correct answer highlights its crucial role in fire safety. A self-closing device is specifically designed to automatically close a fire door after it has been opened. This feature is essential because it helps to maintain the integrity of the fire barrier, preventing the spread of smoke and flames from one area to another, which is vital for ensuring safety during a fire event.

By automatically returning the door to the closed position, a self-closing device ensures that the fire door functions as intended—serving as a barrier to protect occupants and facilitate safe evacuation routes during emergencies. This mechanism is often required by building codes in areas where fire doors are necessary.

In contrast, devices such as hinged door stoppers, electronic door sensors, and manual latch locks do not serve the same critical function. Hinged door stoppers may hold a door open but do not close it automatically. Electronic door sensors might detect movement and control door mechanisms, but they are not specifically designed to ensure doors close post-use in the context of fire safety. Manual latch locks require human intervention to operate, which may lead to the door remaining open if not properly secured. Thus, the self-closing device stands out as the necessary component for ensuring fire doors are