Which term describes a barrier installed in openings of fire walls to resist fire exposure and maintain compartment integrity?

• A. Parapet Wall
• B. Fire Door
• C. Interior Finishes
• D. Common

Answer: (B)

A fire door is the barrier placed in openings of fire-rated walls to resist fire exposure and keep the compartment boundaries intact. In buildings designed for passive fire protection, fire walls create separated sections, and any opening through such a wall must be protected by an assembly that can withstand fire for the wall’s rated duration. A fire door, with its rated assembly, frame, hardware, and seals, is designed to close automatically to block flames and smoke from passing through the opening, preserving the integrity of the fire barrier.

Parapet walls are exterior features at the roof edge, not openings in fire walls. Interior finishes are surface materials inside the space and don’t serve as a protective opening barrier. The term common doesn’t describe a barrier through openings in fire walls.