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)