ICC Commercial Building Inspector Practice Test

What is the minimum required fire resistance rating for the opening protective of a horizontal exit with specified fire doors?

1. 1 hour

2. 1.5 hours

3. 2 hours

4. 2.5 hours

The correct answer is: 1.5 hours

The minimum required fire resistance rating for the opening protective of a horizontal exit is 1.5 hours. This requirement is established to ensure that, during a fire, occupants can safely exit a building through a horizontal exit without exposure to dangerous heat or flames. The fire doors serve as a critical barrier that helps to contain smoke and fire, allowing for safe egress. A fire resistance rating of 1.5 hours indicates that the door assemblies are tested and rated to withstand fire exposure for that duration, providing adequate time for occupants to evacuate to a safe area. This standard is important in commercial buildings where multiple stories or large occupancies are present, adding complexity to evacuation procedures. Understanding these requirements is crucial for building inspectors as they ensure that proper life safety measures are in place and are compliant with local codes and standards.