Wathai2Packs DC Blower Fan 4010 Radial Cooling Fan 5V 2 Pin DC 40mm x 10mm Dual Ball

These fans are resonantly quiet. You can buy quieter ones but they are 5-10 times as much money.Be careful in hooking theses up. There is no standard on the connector as to ground on the left or right. Reverse polarity can smoke a fan.I suggest putting a drop of red nail polish on the hub. That way you can easily see if it’s turning.

I'm using 2x of these fans in a custom amateur radio box for active cooling and hydrogen gas disspation. They work well, keeping the radio well ventilated, and power consumption is in line with the stated 0.1A.Brand new, they made scarcely any noise. With a dozen hours on the clock, a slight droning noise became normal. And certainly these things get extra noisy if the case you're mounting them to experiences any sort of movement or g-shock, but smacking the case will help quiet them temporarily.Not a dealbreaker for me since the radio's speaker easily overcomes the case noise, but your use case may vary

So far, so good. I'm putting a PI-Zero in my attic to control an antenna and I thought I should include a fan.I have so far just printed the 'box base' to attach the Pi and blower to. I'll print another with sides and holes on the end/top for the fan. We will see how it goes.....

It works, but noisy. easy to install because it is 100% compatible with my ACEPC GK1, except connector, but I knew that I would have to cut it and solder an original one. If it wasn't that noisy I would be happy with it.

Designed 3d printed, force air cooled iPad mini kneeboard for general aviation pilots. Fans work very well, are quiet with good airflow and consistent size making them perfect for this use.