This was asked recently. Perf plates are only for internal analyses. You need to use porous medium for external analyses or internal panels.
They are still approximate, they both just act as pressure barriers. They don't model the actual flow through the holes. This is usually pretty good but test physically if you need that level of simulation.
I don't understand Your temp pass through question. If suggest keeping your threads to single questions x
Thank you for the reply. I will look into porous medium in the morning. I can create a new thread for my fan temperature question tomorrow. Thanks for the help.