Review on High-Performance Raspberry Pi 4 Fan - Quiet DC Brushless CPU Cooling Fan with LED - Ideal for Raspberry Pi 4 Model B and 3B+ 3B 2B+ by Joe Martin

These are decent little fans for the price, wish they would last a little longer and stay quiet longer as other reviews have mentioned that some fans get loud pretty quickly and can only be fixed sometimes by adding oil. Build quality is good overall and they last six months to a year on a 12 hour cycle at around 100F and maybe a little over 100F (I use them to cool a jig I've modified and I I have also used them with medium-power LEDs with a small heat sink)