BAD IDEA
My Mac Mini turned on the fan, should I be worried?
Your Mac Mini's fan kicking in means it's doing its job, not a signal for panic—usually.
Mac Mini fans spin up when the machine detects higher temperatures to keep things cool. It's totally normal if you're pushing your device with heavy apps or running it in a warmer room. Unless the fan is blasting constantly or your Mac is heating enough to burn, no need to freak out. Just keep vents clear and occasionally dust it out to help it breathe easy.