What construction element is designed to limit the mushrooming effect of heat and smoke as it rises in large areas of buildings not subdivided?

What construction element is designed to limit the mushrooming effect of heat and smoke as it rises in large areas of buildings not subdivided?

• A. Fire stops
• B. Exit discharge
• C. Type I
• D. Draft curtains (curtain boards)

Answer: (D)

Draft curtains limit the mushrooming effect by interrupting the rising plume of heat and smoke in large, open spaces. When a fire occurs in an area not subdivided, hot gases tend to rise to the ceiling and spread outward, forming a mushroom-shaped layer that can sweep across the room. Installing curtain boards at the ceiling creates a high-level barrier that segments the space, slowing horizontal spread and directing smoke toward approved exhaust paths or suppression zones. This containment makes it easier to manage ventilation, visibility, and occupant safety. Fire stops slow flame travel through concealed spaces, exit discharge relates to the egress path, and Type I is a construction classification, not a smoke-control element.

Draft curtains limit the mushrooming effect by interrupting the rising plume of heat and smoke in large, open spaces. When a fire occurs in an area not subdivided, hot gases tend to rise to the ceiling and spread outward, forming a mushroom-shaped layer that can sweep across the room. Installing curtain boards at the ceiling creates a high-level barrier that segments the space, slowing horizontal spread and directing smoke toward approved exhaust paths or suppression zones. This containment makes it easier to manage ventilation, visibility, and occupant safety. Fire stops slow flame travel through concealed spaces, exit discharge relates to the egress path, and Type I is a construction classification, not a smoke-control element.