My system is on the floor next to my desk, and it would be rather difficult for me to spill liquid on it by accident.
Are top exhaust fans necessary?
You don't think that stagnant air remains in your PC long enough for natural convection to have an effect, do you?
In a closed case? Where do you think that heat goes? Into the case and the surrounding components. When you have a fan and a vent it goes out the top.
> he doesn't use a passively cooled desktop
But that's wrong. The heat goes wherever the airflow pulls it, because your fans are a lot stronger than natural convection.
In fact, for best temperatures you should want intakes in the top, rear, and side of the case, with exhausts in the front and bottom.
This may seem unconventional, but this way you're pulling fresh air from outside the case onto important components and exhausting hot air out the front and bottom where your CPU, graphics card, and motherboard aren't.
It's still limited how much of a difference this would make over the average front intake rear exhaust type setup because, regardless of how your fans are configured, all of the air inside your case is replaced in a matter of seconds.
Natural convection simply doesn't apply to an actively cooled PC. If you were to remove all of your fans it would be a different story, however.
How about dust? Front intake could prevent some before it could reached motherboard, unlike yours.
>what are dust filters
Still not 100% filtered.
I can see my cats laying all over this shit
Neither is a front intake. Anything that would prevent dust from reaching the motherboard is just a hindrance to airflow.
Sure, you could prevent dust from coming in through the front at all by mounting a solid sheet of metal or plastic right behind the intake, but then you no longer have an intake.
You put dust filters on your intakes no matter where they're placed, but no matter where they are they will never be "100% filtered" unless you're using literal HEPA filters, but then again you could place those anywhere and they'd have the same effect as long as the intake goes through them. Doesn't matter if it's at the front or rear/top.