willis_lai@idg.com Symmetrical seasoned PC builders sometimes have to take apart a moment to think about which direction a winnow is blowing. But as our television shows, figuring it unstylish isn't velar at all.
Spend enough prison term around PC builders and PC building forums, and you'll learn pretty quickly that the direction of a subject or CPU cooler fan matters. When a fan's positioned for intake, the intent is to pull in unqualified air. Just when a fan is set as an exhaust fan, the idea is to expel warm air away from the case or ice chest. Some options are useful depending on where the fan resides in the build.
So how do you tell at a carom which way the fan is blowing, especially when even seasoned PC builders sometimes possess to take a moment to think of it? It's jolly oblanceolate, even if your fan's manufacturing business doesn't pass explicitly clear.
Look for the arrow
Alaina Yee / IDG More or less event fans (but not all) give an arrow showing the direction of airflow.
Some fans have a small arrow on the casing that indicate the direction of airflow. Whichever way the arrow points, that's the broadside that air will blow from.
(Yep, it's that easy.)
View the buff blades
Not all fans have an arrow—or perchance you're stressful to value a fan that's installed in a case or happening a CPU cooler and you don't want to unmount it to look after for an pointer. Fortunately, you don't motive the arrow to tell you the direction of airflow. Instead, simply look at the fan blades.
Alaina Yee / IDG Blades curving away from you? That's the intake side.
If the fan blades look rounded—that is, they're curving away from you—that's the intake root. (For the more technical out there: The lentiform side of the fan blades is the intake side.)
Alaina Yee / IDG Fan blades curving toward you? That's the exhaust English.
If the fan blades look like the inside of a dish OR bowl—that is, they're curving toward you—that's the exhaust side. (Put differently, the concave side is where air exhausts.) Often, the exhaust side also has the crosshatch supports for the fan's bod, with a circular sticker in the center that lists brand and model information.
If possible, memorizing the winnow blade shapes is the best method to determine fan direction—you privy tell directly which right smart the fan is blowing.
Why this matters
As fey on supra, the direction of a sports fan matters for airflow. Knowing the way information technology points will determine the C. H. Best places to mount it, especially for a case. It also helps see to it that you really order the correct airflow configuration for your purposes.
Most PCs use positive insistence to get enough cool air passing through the system, which means you require more fans set as consumption than American Samoa evacuate. In quality situations, a builder power as an alternative choose a negative pressure apparatus, where you'll need more fans shooting air out of the case than pulling in. Both check that your car isn't cooking in the empty words generated by its components. But if you aren't paying attention to the fans as you install them (surgery how the case came preconfigured), you could fetch up with a different configuration than intended. Read our guides on how to set u fans you said it to configure fans for positive or negative squeeze setups to get the full details on optimizing your PC's cooling system.
Editor's note: This article was updated on 8/26/2021 to include tutorial video recording.
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Alaina Yee is PCWorld's resident bargain hunter—when she's not covering PC building, electronic computer components, mini-PCs, and more, she's scouring for the Best tech deals. Antecedently her knead has appeared in PC Gamer, IGN, Maximum PC, and Semiofficial Xbox Magazine. You can observe her on Twitter at @morphingball.
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Source: https://www.pcworld.com/article/3619063/how-to-tell-which-way-your-fan-is-blowing.html
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