Which is part of a rated fire door assembly?

• A. Lintel
• B. Sash(es)
• C. Latching hardware
• D. Exit signage

Answer: (C)

A rated fire door assembly is built to stay closed and seal properly to keep the fire and smoke from passing through the doorway. The part that directly ensures the door can close and latch into the frame is the latching hardware. This includes the latch or lockset and the strike plate, all of which must function correctly under heat to keep the door in position and maintain the rating.

Lintel is a structural piece above the door opening in the surrounding wall, not a component of the door assembly itself. Sash(es) refer to window or door glazing frames, not a standard part of a fire door assembly. Exit signage, while important for safety and often required by code, is not considered part of the rated assembly and does not affect the door’s fire-resistance rating.