What is the purpose of the purge button on an SCBA and when should you use it?

What is the purpose of the purge button on an SCBA and when should you use it?

• A. Purge clears air from the facepiece and regulator lines to clear fog when performing maintenance.
• B. Purge clears air from the facepiece and regulator lines to maintain battery life.
• C. Purge clears air from the facepiece and regulator lines to clear fog when donning and during initial pressurization or if fogging occurs.
• D. Purge is only used during maintenance in the shop.

Answer: (C)