🌟 Stay Cool, Stay Productive!
This 6-piece set of 40mm x 10mm DC 5V USB brushless cooling fans is designed for quiet operation and high efficiency. With a dual ball bearing system, these fans deliver a powerful airflow of 3 CFM at a speed of 4200 RPM while maintaining a noise level of just 22 dBA. They are compatible with various USB outlets, making them perfect for a wide range of applications including 3D printers, purifiers, and more.
E**.
It's embarassing having this many fans
I bought these fans for a small raspberry pi project. They worked perfectly. The USB plug in is great for those who already have a USB use case for them. I spliced the fans in to a 5v power source. The fans are moderate level of noise. All of the fans were functional.
E**L
Not really ball bearing, they've got oiled sleeve bushings
I use these in a project, some of which I sell, so I need the fans to last and I need to be honest with my buyers when I say I've used a ball bearing fan. I've had poor success with fans that use only bushings, some cheap ones have had failure rates as high as 30% within the first few hours of use, even.Despite the listing claiming that these have dual ball bearings, the fans that I got ( which matched the image in the listing ) did not.Since I have been burned before, I ( destructively ) disassembled one of these fans and found oiled bushings inside the fan instead of the advertised ball bearings, which is disappointing.That said, since I destroyed one of the fans, I was unable to return the rest, which was a risk I knew I was taking. I have since used a couple of these in less critical projects where I could easily replace the fan and so far none of them have failed, which is at least better than the previous bushing fans I had.So, I'd say that if you need cheap fans that seem to work, these could be for you, but don't expect them to have ball bearings.
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