Thu Oct 26, 2023 2:23 am
"Ambient" assumes free air dissipation of heat. If the device is in a cabinet then the issue is maintaining an air flow something equivalent to being in free air. Given the device specifications and tolerances, the real question is not the device but the air around it.
My example is that living closer to the equator than the south of Spain, hemisphere switched, I have a router, switch, and small UPS (the biggest heat generator) stuffed into a small high cupboard shelf in an unconditioned room, because that is where the builder put the patch panel. I use two 120 mm USB-powered impellers with a multi-stage thermostat to keep ambient temperature below 30° in Summer, by pushing air through narrow slits from the rear to front. Fans trigger at 26° and max out at never-reached 36°. Really, this is over-kill.
Given satisfactory ambient, the equipment will be fine. It is within design parameters. My advice is to stop worrying about CPU temperature and monitor ambient. If you are still nervous even with a good ambient temperature then very quiet, reliable, small (80-120 mm) USB-powered fans will cool both the equipment and your worries.