Wathai 2 Pack 30mm x 10mm 5V Small DC Brushless Cooling Blower Fan - 9500RPM, 1.85CFM, Desktop Compatible

Surprised by how much airflow these produce

These fans move a lot of air for their size, and can get 'loud' near Max speed... but it's a fan... they make noise. I dropped speed to ~1250rpm, and the noise is hardly noticeable, and still provides a great deal of air flow considering how small these things are.

I got a few of these to build a fog removing system for my airsoft mask. they work well, they are very lightweight and use very little power so with a small battery they can run for a good while.

Used as a replacement for the failed stock fan in my one year old JGAurora A5S. Fits properly with no issues. Runs quieter than the stock one used to run. Having a 2-pack is a plus. However, the leads are about 3 inches too short. I ended up trimming them, cutting the leads off the old fan (together with the connector), and soldering the wires to those on the new one, with shrink-tubing for the insulation.

These the smallest form factors I can find and they have great air output for cooling off the inside of a cosplay mask.