CAS Practice Exam 2026 – Complete Study Guide

Propping open a fire door compromises the safety features that are integral to fire prevention and management in a building. Fire doors are designed to contain smoke and fire to specific areas, restricting the movement of these hazards and allowing for safer evacuation.

When a fire door is propped open, it creates a potential pathway for fire to spread through the building. This occurs because the door, when closed, acts as a barrier that limits the oxygen available to the fire, thus slowing its growth and spread. By leaving it open, additional oxygen can feed the flames, increasing their intensity and allowing the fire to propagate more easily to unprotected areas.

This situation severely undermines the fire safety protocols within the structure, making it more dangerous for occupants and increasing the likelihood of significant property damage as well. In contrast, the other options do not accurately reflect the consequences associated with propping open a fire door, as they discuss outcomes that are not aligned with the primary safety objectives of a fire-rated door.