What is the primary difference between smoke barriers and smoke partitions?

• A. Smoke barriers are non-rated; smoke partitions are rated.
• B. Smoke barriers are rated barriers designed to restrict smoke and create independent compartments; smoke partitions are less protective barriers used to slow smoke movement but are not considered full smoke barriers.
• C. Smoke barriers are only in corridors; partitions are only in rooms.
• D. Smoke barriers completely block all smoke; partitions allow all smoke.

Answer: (B)

The key idea is how much protection and continuity these two types of barriers provide. Smoke barriers are fire-resistance–rated assemblies that are intended to restrict the movement of smoke and create independent smoke compartments. They are designed to stay intact during a fire, typically extending floor to floor or from structural ceiling to structural floor, with protected openings (like self-closing doors) to maintain the barrier.

Smoke partitions, on the other hand, offer a lesser level of smoke control. They are used to slow or limit smoke movement between spaces but are not considered full smoke barriers; they may not be fire-rated or required to maintain a persistent, continuous compartment under fire conditions.

So the main difference is the level of protection and the requirement for continuity: barriers are rated and create separate, protected compartments, while partitions provide only partial smoke control and do not function as full smoke barriers.