Which ceiling type is designed to collapse during a fire?

• A. Alarms
• B. Open-Grid Ceilings
• C. Discharge Criteria
• D. Drop-Out Ceilings

Answer: (D)

Ceiling assemblies can be designed to respond to fire by changing their state, and one such design is a drop-out ceiling. Drop-out ceilings use tiles or panels that are engineered to detach or collapse when exposed to high heat. This creates an opening in the ceiling, allowing heat, smoke, and flames to vent more readily and preventing the ceiling from acting as a barrier. It also helps ensure that sprinkler water can reach the fire more effectively because the ceiling area above the heads is open.

The other options aren’t ceiling types built to collapse in a fire. Alarms refer to detectors, not a ceiling construction. Open-grid ceilings are designed to be open and do not collapse as part of their function. Discharge criteria describes how discharge from sprinklers should perform, not a type of ceiling.