Since your main motivation is to keep dust out of your pc, I have a number of concerns with your implementation:
- You mentioned having only one fan, which is set to exhaust.
- You have cut an (unfiltered) opening into your side panel "to help push out hot air".
Since the only fan in your system is to exhaust air, you're creating negative pressure
inside your case, meaning you're exhausting more air than is coming in.
It's generally agreed that positive pressussure
combined with fan filters on the intake fans is the most efficient way to keep dust out of your system. Let me try to explain why below.
So, your rear fan is exhausting air, for the sake of argument let's say it's exhausting about 10 liters of air per minute.
Now, you have to ask yourself, there's 10 liters of air coming out of my case every minute. Where is that air coming from?
In a normal setup, the answer to that question would be that it's pulling the air in through all of the unfiltered nooks and crannies in your pc - the front grill where normally a fan would be mounted, gaps between your sidepanels and the case, even places like the expansion slot covers on the back of your case, seeing as they're usually perforated to allow some air to pass through.
The issue with this is that you have no control
over where the air is coming from, and so it's impossible to keep the dust out of your system with something like a fan filter. The air moving into the system will be carrying along dust, and seeing as none of your intakes are filtered, it'll move into your system and stick to whatever it comes across.
Now, the reason I said that this is for a normal setup
is that you cut a big gaping hole into the side of your case, thinking it'll help exhaust air from your system.
I'm not saying this won't help with case airflow, because it will, just not for the reason you thought when you made the hole. Since your case is dealing with a negative internal pressure when it comes to your fan config, the hole won't be exhausting air but instead pulling it in through there. Now, this'll be fresh air so it'll help cool down your internals, but it'll also have a (un)healthy portion of dust riding on it. So instead of making your dust problem better, it's actually making it worse.
What I would propose is this:
- Add two fans to the front of your case, make sure they are filtered. You could either order some magnetic fan filters online, or if you're a fan of DIY solutions you could get some pantyhose and use that to filter the airflow coming into your case from the fans.
- Patch up the hole in your side panel. This'll be less important once you add in the two extra fans in the front, but aesthetically speaking it looks a bit ghetto-rigged.
Now, what will change if you add the two fans to the front of your case, and set them to intake air?
Before you made this change you had 10 more liters of air leaving your case every minute than you had coming in. If you add two fans to the front that's 20 liters of air coming in. So the new result is that there's more air coming into the system than there is going out. Common sense would have you wondering, well if the negative pressure was bad, wouldn't positive pressure be equally bad
The result would be the opposite of above: Instead of air looking to come into the case from every nook and cranny, the air is actually trying to escape through all of these holes (cause those 10 extra liters of air have to go somewhere).
Now, since you (hopefully) added filters of some description to the fans introducing air into the system, all of the air coming into the system will be (mostly) dustless
. Sure, the extra air will leave the case through all of the same places I mentioned before, but that actually prevents dust from making its way into your case through all of the little holes and grills you don't have control over.
The result here is a way healthier airflow, and MUCH
better dust control. Your temperatures will drop, your system will be cleaner, your components will live longer, and everyone's happy.
I'm very sorry for the editorial, by the way, but I just felt this needed some explaining, especially since your main quoted reason for only having one fan seemed to be dust control.tl;dr: If dust is a concern negative pressure is bad, positive pressure is good. Make sure to filter your air intakes!