What is the purpose of pre-discharge warning time?

• A. To calibrate detectors prior to release.
• B. To provide occupants with time to evacuate or prepare before agent release.
• C. To adjust ventilation rates during discharge.
• D. To verify cylinder labeling before release.

Answer: (B)

The main idea is to protect people by giving them a heads-up before the agent is released. Pre-discharge warning time creates an audible/visible alert so occupants can evacuate safely or move to a protected area before exposure occurs. This window lets people react, find exits, close doors if feasible to slow agent spread, and otherwise prepare for the discharge. It’s specifically about informing and safeguarding occupants, not about calibrating detectors, changing ventilation during discharge, or verifying labeling. The duration is set by system design and occupancy needs, but the core purpose remains ensuring a safe, orderly response prior to release.