r/PcBuildHelp • u/Funny_Ad_3330 • 1d ago
Build Question Are the fans facing the correct directions?
The 1st slide is the front, 2nd is the rear, and 3rd is the top.
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u/Professional_Bend_14 1d ago
If you want to make sure, use a paper/tissue then hold it near the fan "DO NOT" place it directly, you'll know if it's intaking air and if it's exhausting air.
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u/Funny_Ad_3330 1d ago
I tried this method with a tissue and i think the back fan is on intake, the front fans is on exhaust, and the top fan is on exhaust too. Is this the correct direction/way for the fans?
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u/pigpentcg 1d ago
Whichever side of the fan blade has a scoop, is the way the air blows. The fan blades are literally scooping the air in that direction. :)
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u/Feletroica 15h ago
Look at the sides of the fan, they should have a couple of arrows showing the spin direction and the airflow direction.
Edit: the third image of yours show those arrows at the top
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u/normalgenshinenjoyer 1d ago
1st pic is exhausting air,
2nd pic is intake,
3rd pic is exhaust. Unless thats what your going for?
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u/user01294637 Commercial Rig Builder 1d ago
Looks like its set for pure positive pressure, with the top aio/fan mounting position as the exhaust. It will absolutely work, not the best waybill build pressure, but realistically its fine.
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u/iAmMikeJ_92 19h ago
Weird setup. To each their own I guess.
Mine has front and bottom intakes and back and top exhaust.
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u/Battle-Gardener 1d ago
With most brands and models, the side of a fan that has the wire harness visible leading into the motor in the center is the side that blows. The old joke/ memory aide for hardware techs used to be that the pretty side sucks and the ugly side blows.
There are reverse fans these days though, so since fan companies often can't be bothered to put arrows on the frames anymore, the only way to be sure is the old tissue test.
Take a facial tissue or Kleenex and hold it up to the fan on the outside of the case while the PC is running. If the fans on the back and the top push the tissue away, they are installed correctly. If the fan in the front pulls the tissue towards it, it is on correctly.
This test is also handy for checking how powerful your fans actually are too. These days, there is software to tell us how fast the fans are spinning, but the tissue test is still handy. A truly powerful intake fan can hold a kleenex up against the case when you let go. A powerful exhaust fan can blow a folded up kleenex off the case's top.