FWIW …
I have the HighPi Pro 5V Cooling Fan installed in a HighPi case that is acting as a media server
Initially installed with
echo ‘dtoverlay=gpio-fan,gpiopin=14,temp=60000’ >> /boot/config.txt
Rebooted & then
apt install lm-sensors fancontrol
pwmconfig
systemctl enable --now fancontrol
Gives me a nice cool Raspberry Pi 4B that doesn’t seem to get over 50° even when stress testing