What is the required door assembly rating for a wall with a fire-resistance rating of 45 minutes?

The required door assembly rating for a wall with a fire-resistance rating of 45 minutes is indeed 45 minutes. This requirement is based on the principle that the door and its frame must provide a level of protection and fire resistance that is equal to or greater than that of the wall in which it is installed.

In cases where walls have a designated fire-resistance rating, such as 45 minutes, the door must match this rating to ensure that the integrity of the fire barrier is maintained. This is critical not just for life safety but also for property protection, as it helps to prevent the spread of fire and smoke from one area to another.

Therefore, a door assembly rated for 30 minutes, 1 hour, or 2 hours would either be insufficient compared to the 45-minute wall rating or exceed the requirements unnecessarily, which may not be compliant with specific building codes or regulations. Hence, a door assembly rated at 45 minutes is the correct and appropriate choice to ensure compliance with safety standards.