What term refers to a continuous membrane used to subdivide a concealed space to resist the passage of smoke and heat?

What term refers to a continuous membrane used to subdivide a concealed space to resist the passage of smoke and heat?

• A. Fire Door
• B. Draft Stop
• C. Court
• D. Dwelling Unit

Answer: (B)

The principle here is limiting how smoke and heat move through hidden spaces by using a continuous barrier. This is called a draft stop—the uninterrupted membrane placed within concealed spaces (like ceilings, under floors, or attic/ceiling cavities) to subdivide them and slow the spread of fire and smoke. A fire door, while it helps maintain a fire barrier, is a door installed in a barrier and isn’t the continuous membrane that subdivides concealed spaces. A court is an open or courtyard area in a building, not a barrier in concealed spaces. A dwelling unit is a living space and not a barrier used to block smoke travel.

The principle here is limiting how smoke and heat move through hidden spaces by using a continuous barrier. This is called a draft stop—the uninterrupted membrane placed within concealed spaces (like ceilings, under floors, or attic/ceiling cavities) to subdivide them and slow the spread of fire and smoke.

A fire door, while it helps maintain a fire barrier, is a door installed in a barrier and isn’t the continuous membrane that subdivides concealed spaces. A court is an open or courtyard area in a building, not a barrier in concealed spaces. A dwelling unit is a living space and not a barrier used to block smoke travel.