How do you know a Protective Breathing Equipment (PBE) is activated?

• A. The hood will start deflating and condensation seen on viewing window.
• B. There is a continuous alarm beep from the hood.
• C. A "Snap" sound will be heard from the Automatic Activation Trigger when head is inserted into PBE.
• D. Oxygen gauge shows full.

Answer: (C)

Activation is indicated by a distinct audible cue from the Automatic Activation Trigger as soon as you insert your head into the hood. That “snap” sound shows the chemical oxygen generator has been ignited and oxygen is beginning to flow, so the hood is now delivering breathable air. The other signs aren’t reliable indicators of activation—condensation on the viewing window can happen for reasons other than activation, an alarm beep isn’t the standard activation cue, and the oxygen gauge isn’t used to confirm activation in that moment. The snap from the trigger is the clear, correct signal that the PBE is active.