coolerguys12v Ultra Quiet Fan for Pi Devices, 3D Printers, and Microelectronics (40x20mm)

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I should have read closer since I needed something with higher flow rate. This is very leisurely. Good if you're in a glovebox and don't want to mess with a balance or powders too much. Not so great for pulling air through a packed bed. It's very very quiet, barely noticeable.

I purchased this fan to replace a failing controller fan on my Creality CR-10 S4 printer. It was an east drop-in replacement. No mods! The flow rate is a little lower on this fan than the stock fan, but it is sufficient to keep evrything cool and happy inside the controller case.

This mini fan is wonderful because it is super quiet. It runs at lower speed but it produces enough air to cool down things. I used this fan for a mini ducted heat exchange ventilator for my cat house.

Came in no time. Packaged in a plastic bag with a mailer bag. No damage. New as advertised.Mounting holes were for a computer application and I had to make them smaller for my situation...2 pin. Lower RPM but very quiet. It's quiet folks, don't expect it to push a lot of air.Perfect replacement for me. Made my old product new again. I am very satisfied and would recommend this product and seller (Coolerguys shipped by Amazon).

Nice fan. It's essentially silent.

This fan was a perfect fit after the original fan’s blades were damaged when the battery charger fell to the ground. A little noisier than the original and doesn’t move as much air as the fan it replaced. But for the money, it meets my needs for now.

Perfect replacement part for my 40mm X 10mm extruder fan on my 3D printer. Only reason I'd give it 4 stars is that the polarity was backwards.The fan is super quiet though. Would definitely recommend as a replacement part for similar applications.

I was using a Noctua fan is supposed to be quiet. It got noisy after a few years of use. Was looking for a quiet fan to replace it and decided to try this. The cooler guys quiet fan really lives up to its name. I can hardly hear it at arms length. Forgot it was there after a while. Highly recommend

I bought these to use a part cooling fans for my 3Dprinter. They are very quiet, almost completely silent. However, they problem is that they just don't move any air, and that makes them useless as part cooling fans.