You haven't under stand my concept of the fans then.
To be fair to me you haven’t made any attempt to explain this at all until now — if you had answered the question in the first place I would’ve understood and argued against it
The fans exhausting out in the front is controlled but by the mini itx system and the front fans are controlled by the atx system. Meaning when only one of the systems turned on. It's either the front fans or the front exhaust fans that are running. When both systems are running, the front exhaust fans are disabled, meaning they are not turning at all. Do you understand the concept better now?
This just seems like bad airflow to me... I have to admit that when I was reading your build log I didn’t understand the need for two Aqueros — it makes sense now, but I think it’s inefficient.
Are the side exhaust fans the only difference when either system is on? Meaning do any of your other fan sets behave differently when a particular system is on? Also, and again, my apologies if I’m misreading the pics, are you sure it’s setup this way? It looks like all of your fans are spinning in the pics.
IMO, you’re doing a disservice to your cooling potential with those fans as exhaust. Could you explain your airflow configuration in more detail?
IIRC, with just the itx system on, all of the airflow from the bottom intakes is being pulled out of the side before it ever reaches the itx system. You’re essentially pulling air away from the itx system in a negative pressure setup, relying on convection from the system, preventing airflow to the SSD/itx system by pulling it away. If the top exhausts are running in this configuration it’s even worse.
I would run the side exhausts as intakes regardless of which system is running, and especially when both are running. I don’t mean to be rude, but I can’t imagine a scenario where running them as exhaust helps with cooling anything.
Just my 2 cents, maybe there’s a layout you’ve setup that I haven’t even considered that resolves my concern!
Hell, my suggestion probably won’t yield more than a couple of degrees off of your SSD, so maybe it’s all moot anyway.