🔍 Key Concepts

• Operation of portable CO2 fire extinguishers • Function of the locking pin and handles on an extinguisher • What action keeps the extinguisher discharging without needing to be held open

💭 Think About

• Which part of a CO2 extinguisher is designed only as a safety device to prevent accidental discharge? • On a typical CO2 extinguisher, what do you normally do with the handles to start and stop the flow of CO2? • Which listed action would allow CO2 to continue to flow on its own once you’ve started discharge?

✅ Before You Answer

• Identify the normal sequence: pull pin → aim → squeeze handle on a CO2 extinguisher • Decide which option would stop discharge vs which would maintain discharge • Think about whether inverting a CO2 extinguisher actually changes the discharge mode or is unrelated.