Argon makes really cool cases for Raspberry Pi's. I currently own their Argon One v3 case. It has a built in fan as well but requires a script to be installed so that fan can turn on and adjust RPM according to CPU temps.
The link to the script can be found on the page thirteen of this PDF.
curl https://download.argon40.com/argon1.sh|bash
I tried it and works beautifully on Raspberry Pi OS. I was wondering whether there is a way to make this work on OpenWRT.
Edit: I tried running it and received this:
curl: (23) Failure writing output to destination, passed 8192 returned 0
Bash isn't installed by default.
Even if you install bash, I'd be very surprised if this script would work in openwrt without extensive modification. Glancing at it, it expects the config.txt file to be in a particular location. Many other things follow that assume raspbian or ubuntu, etc. It's also looking for python and probably other packages which aren't there by default and will have significant differences in package support.
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OK, I think I somewhat fixed the issue by accident. There's a jumper in the case. You can set it to 1-2 or 2-3. The default 1-2 options requires you to press power on button to power the pi up. And with 2-3, power always flows to the ip and it powers up as soon as electricity comes back up.
I set it to 2-3 because it was really problematic to go to it and power it up manually after every outage. But for some reason that jumper option also enabled always on fan mode.