2Packs Wathai 30mm 24V Blower Fan Brushless Exhaust Fan 2pin 30 x 30 x 10mm for DIY Cooling Single Board Computer, Custom Setu, Hotend

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

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.

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.

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.

They are a little noisy, but that isn't unexpected for the amount of air being moved by such a small fan. They do an excellent job of cooling.

I would give 5 stars but they were the. Wrong size.

Cheap fans but they work.

Works well, comes with some small machine nuts and bots for mounting. Good air flow even at 3.7v