What term describes a complete, tested assembly that prevents the passage of flames, smoke, and toxic gases through penetrations in fire-rated walls and floors for a specified period?

• A. Firestop System
• B. Fire Wall
• C. Hard Wall System
• D. Flex Duct

Answer: (A)

Firestop system is the term for the complete, tested assembly that seals penetrations in fire-rated walls and floors to block flames, smoke, and toxic gases for a defined period. It isn’t just a sealant or a single material; it includes the penetrating item (such as a pipe or duct), the firestop material, any sleeves or collars, and the surrounding construction, all installed to a tested listing. When properly applied, this system preserves the fire-resistance rating of the wall or floor for the specified duration by preventing the fire from traveling through the opening. A fire wall refers to the barrier itself, not the sealing assembly around penetrations, and the other terms don’t describe the complete, tested penetrations protection described here.