One of my masks came with a fan. I'd say it was worth it. It saved me quite a few times in game. I ended up the one who could see and they were the ones who had fog on their lenses.

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A5 Super Response Trigger Owner.
Autococker Tactical Trilogy Owner
X7 E Trigger Owner
Woodsball. Recon/Scout Sniper/Designated Marksman/Sabre/Tactical Specialist