Which term refers to a continuous membrane that resists smoke and heat in concealed spaces?

Which term refers to a continuous membrane that resists smoke and heat in concealed spaces?

• A. Draft Stop
• B. Contents and Furnishings
• C. Elevator Lobby Door
• D. Dwelling Unit

Answer: (A)

A draft stop is the continuous membrane that resists smoke and heat in concealed spaces. In NFPA 101, draft stopping creates barriers within attic, crawl, plenum, and shaft spaces to limit the spread of fire and smoke from one concealed area to another. This helps compartmentalize the building, buying time for occupants to evacuate and for responders to gain access. It’s not about items inside a space (contents and furnishings), doors in elevator lobbies, or the dwelling unit itself; those terms describe other aspects of a building, not the protective barrier in hidden voids.

A draft stop is the continuous membrane that resists smoke and heat in concealed spaces. In NFPA 101, draft stopping creates barriers within attic, crawl, plenum, and shaft spaces to limit the spread of fire and smoke from one concealed area to another. This helps compartmentalize the building, buying time for occupants to evacuate and for responders to gain access. It’s not about items inside a space (contents and furnishings), doors in elevator lobbies, or the dwelling unit itself; those terms describe other aspects of a building, not the protective barrier in hidden voids.