Review on 🌀 ANVISION 2-Pack 40mm x 10mm DC 5V USB Brushless Cooling Fan with Dual Ball Bearing Design - YDM4010B05 by Bryce Wohlman

For the past few months I've been using these fans to force air through tight ducts and improve cooling on Raspberry Pi cases (only one of them is pictured). So far they've delivered very consistent cooling with consistent reliability for all intended purposes, and while you can hear the fans a little in a perfectly quiet room, the noise is imperceptible when other ambient noise (computer fans, air conditioning, etc.) is combined with two heatsinks and good quality cases I've been able to get temperatures below 30 degrees on my Raspberry Pi 4s, the only problem is that the wires that attach them to the fan motor can easily be cut, so be careful when installing, both, and get in the way Don't settle for negligible noise levels, there probably isn't one better for them at the moment, unless you choose another method of powering them (like the versions with GPIO pins) UPDATE 03/24: after running these fans at higher settings definitely produce a lot more noise. When used for 3D printers for the sake of their silence or other applications that require higher power settings, they get very noisy.