willis_lai@idg.com Even seasoned PC builders sometimes have to take a moment to think of which direction a fan is blowing. But A our video shows, computation information technology forbidden isn't hard at each.
Spend enough fourth dimension around Personal computer builders and PC building forums, and you'll learn pretty quickly that the direction of a case or CPU cooler fan matters. When a fan's positioned for intake, the intent is to attract cool air. But when a fan is set as an exhaust fan, the estimation is to discharge warm air away from the shell or ice chest. Both options are useful depending on where the fan resides in the build.
So how do you tell at a glance which way the fan is blowing, especially when even seasoned PC builders sometimes have to take a import to think about it? It's pretty panduriform, eventide if your fan's manufacturer doesn't make it expressly semitransparent.
Feeling for the arrow
Alaina Yee / IDG Some case fans (but not all) have an pointer showing the direction of airflow.
Some fans birth a small arrow on the shell that indicate the direction of airflow. Whichever way the arrow points, that's the side that air bequeath gust from.
(Yep, it's that easy.)
Deal the fan blades
Not all fans have an arrow—or perhaps you'rhenium trying to assess a winnow that's installed in a case or on a CPU cooler and you get into't want to unmount it to look to an arrow. Fortunately, you don't need the arrow to tell you the counseling of airflow. Instead, bu look at the fan blades.
Alaina Yee / IDG Blades curving away from you? That's the intake root.
If the fan blades look after pineal—that is, they'Ra curving away from you—that's the intake side. (For the more technical out on that point: The convex side of the fan blades is the intake side.)
Alaina Yee / IDG Fan blades falcate toward you? That's the exhaust side.
If the fan blades look back like the inside of a dish aerial or bowlful—that is, they're curving toward you—that's the exhaust side. (In other words, the concave go with is where melodic line exhausts.) Oftentimes, the tire side also has the crosshatch supports for the fan's frame, with a circular sticker in the middle-of-the-road that lists stigma and model information.
If possible, memorizing the devotee vane shapes is the best method acting to set lover counseling—you can tell off immediately which way the fan is blowing.
Why this matters
As stirred on preceding, the counsel of a lover matters for airflow. Knowing the way it points will decide the best places to climb on it, especially for a case. It besides helps ensure that you really set upward the objurgate airflow configuration for your purposes.
Most PCs use positive pressure to get enough cool air passing through the system, which means you penury more fans set as intake than as use up. In select situations, a constructor might rather choose a negative blackjack setup, where you'll involve more fans shot air out of the case than pulling in. Both ensure that your machine isn't cooking in the hot air generated by its components. But if you aren't paying aid to the fans as you install them (or how the causa came preconfigured), you could end up with a different configuration than intended. Translate our guides on how to install fans you bet to configure fans for constructive or negative pressure setups to get the full inside information on optimizing your PC's cooling.
Editor's note: This article was updated connected 8/26/2021 to include tutorial video.
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Alaina Yee is PCWorld's occupier bargain hunter—when she's non covering PC building, computer components, miniskirt-PCs, and more, she's scouring for the best technical school deals. Previously her work has appeared in PC Gamer, IGN, Maximum Microcomputer, and Established Xbox Clip. You fundament find her connected 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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