A fire barrier is not required where which of the following is provided?

A fire barrier is specifically designed to prevent the spread of fire and smoke between different areas of a building. The question focuses on circumstances where a fire barrier may not be essential.

Glass walls forming smoke partitions can act as a barrier to smoke movement, mitigating the need for additional fire barriers in certain cases. Smoke partitions are intended to control the spread of smoke, particularly in large spaces where smoke might travel quickly without the presence of a physical barrier.

A glass-block wall with a 3/4 hour fire protection rating serves as a fire-resistance-rated assembly that can protect areas by maintaining the integrity of the wall against fire for a specified duration. This level of protection may fulfill the requirements that would otherwise necessitate a fire barrier.

When it comes to atriums, they often require careful design considerations due to their open nature. In some configurations, if proper fire-resistive assemblies or other protective measures are in place, fire barriers may not be necessary between the atrium and adjoining spaces for certain specified floors.

Thus, options A, B, and C describe various situations where alternative measures can replace the need for a traditional fire barrier. Consequently, the correct answer that encompasses all these alternatives is that a fire barrier is not required when any