Which requirement is necessary for fire doors?

All fire doors are required to meet certain standards to effectively prevent the spread of fire and smoke. One of the key necessities is that they must be latching. This means that when the door is closed, it can secure firmly in place, preventing smoke and flames from easily passing through.

Moreover, fire doors are also required to be self-closing. This characteristic ensures that the door automatically returns to a fully closed position after being opened, which is vital during a fire situation when quick containment of smoke and flames is crucial.

In some cases, fire doors are mandated to be automatic closing as well, particularly in environments where manual operation may not guarantee that the door remains closed during an emergency. This feature enhances the door's effectiveness in fire resistance by ensuring that it closes without delay upon activation of a fire alarm or sprinkler system.

Considering these critical safety requirements, it becomes clear that a fire door must incorporate all these features to function optimally in protecting lives and property during a fire. Hence, the inclusion of latching, self-closing, and potentially automatic closing mechanisms collectively ensure the fire door performs its intended safety role within a building.