Which ceiling type facilitates open space and smoke movement?

• A. Drop-Out Ceilings
• B. Open-Grid Ceilings
• C. Test Connection
• D. Alarms

Answer: (B)

Ceiling construction determines how air and smoke move through a building. An open-grid ceiling leaves gaps in the grid and often a plenum above it, so air and smoke can rise and flow freely between rooms. That openness creates a continuous space for smoke to travel, making it easy for smoke to move throughout the area.

A suspended or drop ceiling uses tiles with a more enclosed plenum above, which acts as a barrier and can restrict or direct airflow, slowing or altering how smoke spreads between spaces.

Test connections and alarms are system components and not ceiling types, so they don’t describe a ceiling that affects open space or smoke movement.