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Fan shroud and/or higher static pressure fan?

post #1 of 6
Thread Starter 
Not sure if I should post this in water or air cooling, will post here since it's mostly a fan question.

So I installed an H50 recently, with 2 Noctua SF12B-FLX fans @ 1200RPM to Push/Pull over the radiator, blowing externally out of the case (with 2 140mm intakes from the top). When I put my hand near the push fan inside the case I feel a lot of air blowing off the sides (it feels like at a slight distance its blowing away from the fan, but the fan is definitely pushing the right way, it's weird and hard to explain). Basically feels like not all of the airflow is being pushed through the radiator, would a shroud help this at all, or should I replace the fan with something with higher static pressure, like a scythe Flex? And if I do switch fans to a flex would it be smarter to put the higher pressure fan as the push or the pull?

If a shroud is the way to go, where would I go about getting / making one? Thanks in advance
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post #2 of 6
A shroud is mostly meant for eliminating the dead spot behind the fan's motor. Go for one with more pressure like a 38mm.
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post #3 of 6
From your description, it seems to me that the two top 140mm fans might be spinning too fast and producing enough airflow to interfere with the air intake of the push-fan of the H50.
post #4 of 6
Thread Starter 
It's possible, but I'd be surprised, there is a filter across the top area for dust, that seems to drastically cut down on airflow, so it keeps the internal cool but not windy. I can barely feel the air coming off the top.

I'm not sure about a 38mm, the reason I got the noctuas was their quiet fan profile, I'm not sure I want to throw in something that could be that loud, as I sleep very close to the machine and I don't turn it off heh.
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post #5 of 6
Too bad you don't have a Lian Li case. You could remove their lousy fans and turn them into shrouds. Lian Li fans make beautiful shrouds.

Your poor P12 push fan is having to fight the resistance of the rad + the resistance of the rear grill. It needs substantial static pressure, and it sounds like some air is getting out. You might try this. I know it's out of stock, but now you'll know what to look for. Or otherwise seal up the interface between the fan and the rad.

You can remove your rear grill to lessen the air resistance.

If you are considering new fans, do not waste your money on S-Flexes. Instead, look a Martinm210's fan-testing on a rad.
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post #6 of 6
I forgot to say, only use push/pull with identical fans. You could potentially damage them if you mix them. They won't cool as well either.

38mm can be very quiet, even quieter than 25mm since they have thicker blades which means lower rpm/airflow. You just have to find a quiet one . There's plenty of guides on here for that purpose. If you get one with enough static pressure you probably will only need to use one.
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Reborn Legacy
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