Firestopping products resist the passage of which elements between levels?

• A. Smoke
• B. Fire
• C. Both Smoke and Fire
• D. Neither

Answer: (C)

Firestopping is used to preserve the fire-resistance rating of walls and floors where services pass through, especially between levels. Its purpose is to stop the spread of fire and the movement of smoke through those openings. Firestop products are tested to withstand high temperatures and to limit the transmission of hot gases and smoke, not just flames. This dual role is essential for occupant safety because smoke can travel more quickly than flames and hinder evacuation. So the best answer is that firestopping resists both smoke and fire.