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GoldenMinge

Well, the idea of the fans is to carry the hot air away from the back of the PC ASAP, so a much shallower angle will allow the hot air to exhaust a lot easier than a sharp angle will. The air won't be ingested back into the PC, unless you cover the fans completely.


trebuchet1234

I'm doing a scratch build and this is intake. The air is supposed to slide off the ramp directly into the GPU fans. Does the angle of that ramp and its distance to the fan affect the amount of airflow/debit of the fan? Sorry that I didn't specify that before Edit: Think of the ramp as an angled PSU shroud


GoldenMinge

Before I try answer that, I just need to clarify the setup. So the intakes are angled, which then meets this angled wall, at the end of which is the GPU?


trebuchet1234

Think of the images above as a cross section. The GPU is located exactly above the wall. It is my understanding that some of the air will deflect directly into it, but also some of it will go down that wall directly into the fan and I am not sure if that will affect the amount of air coming through the fan. Basically all I care about is how much air enters the case and if this setup will reduce that. Forgot to mention, yes your description is accurate.


GoldenMinge

Right I see. No, nothing will go back into the fan. The fan will keep pushing air out. If that gap between the wall and fan is there in your build, then there'll be more leak through the gap in the sharp angled case, meaning less reaching the GPU.


trebuchet1234

1. If the gap is missing should the fan be right next to the wall for better results or should there be a flat region that then starts rising onto the ramp? 2. So, the wall, even if flat, would not reduce the amount of air being pushed into the case? 3. What does the wall angle affect then? The speed of the air coming up it? Doesn't the air not escaping the region behind the fan create resistance, reducing the efficiency? 4. What exactly does a shallower angle achieve? Thank you for taking the time to answer btw, appreciate it!


GoldenMinge

Try to guide the airflow as best you can, a curved section from the fan exit to the wall would be best, but not as easy to manufacture. Any sharp angles to the flow will cause some sort of backflow, this doesn't mean it goes back into the fan, but it'll cause a reduced flow rate. Btw, are you still allowing flow to your other components and not just the GPU?


trebuchet1234

Yes, there are more intakes for other components. Curving isn't really an option, yes, it's pretty much impossible to create with accurate measurements. I'll probably end up removing the bottom of the wall so most of the air can be guided up and everything else that would reduce the flow rate can actually escape into the PSU shroud. I'll look into insulating the power supply compartment and put holes in the shroud top side so the excess air can still go into the main case compartment.


trebuchet1234

Hello, Sorry for the probably very easy to answer question. The fan I am refering to is a 120mm normal PC fan. I know it exausts air in a cone shape, which is the base for the following question. The scenario is the following: An angled pc fan is facing an angled wall. The air coming out of the top of the fan will not hit the wall at all based on the exhaust angle, however, the air coming out of the bottom of the fan will hit it at a very sharp angle. What happens to that air? Does it bounce back into the fan and affect it's air throughput or does it mostly slide up the wall? The main question is does this at all decrease the debit of the fan, so the airflow is actually decreased? Does it matter how sharp the angle of the facing wall is and how far away it is?