Which term is used to describe the system that seals penetrations to prevent fire, smoke, and toxic gases?

Which term is used to describe the system that seals penetrations to prevent fire, smoke, and toxic gases?

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

Answer: (D)

The main idea here is the protection of fire-rated barriers around openings. A firestop system is the set of materials and devices—such as sealants, intumescent wraps, sleeves, and collars—installed around penetrations where pipes, cables, or ducts pass through walls or floors. Its job is to restore and maintain the barrier's fire-resistance rating, so fire, smoke, and toxic gases cannot travel through the opening. This is why it’s the best term: it specifically describes the assembled system used to seal penetrations and preserve the integrity of the barrier. A fire wall is the actual barrier itself and not the sealing system around penetrations; a flex duct is just a duct that might require sealing, and fungi is unrelated.

The main idea here is the protection of fire-rated barriers around openings. A firestop system is the set of materials and devices—such as sealants, intumescent wraps, sleeves, and collars—installed around penetrations where pipes, cables, or ducts pass through walls or floors. Its job is to restore and maintain the barrier's fire-resistance rating, so fire, smoke, and toxic gases cannot travel through the opening. This is why it’s the best term: it specifically describes the assembled system used to seal penetrations and preserve the integrity of the barrier. A fire wall is the actual barrier itself and not the sealing system around penetrations; a flex duct is just a duct that might require sealing, and fungi is unrelated.