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Thread: Plastic sheets that cover half the fan: why?

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    Default Plastic sheets that cover half the fan: why?

    I've seen a number of powersupply designs with 120mm+ fans with a clear plastic sheet covering as much as half the fan.

    Why?

    Optimizing turbulence? Do some components like to run hotter?

    WHY?! I MUST KNOW THE SECRET!

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    Blocking the air in that regions causes a low pressure area, which forces the air through the PSU in an L-shape and out the rear of the PSU. It's basically done as a cheap and easy way to direct airflow in a PSU.

    A lot of higher-end units do it less often and if they do it, they do it in smaller areas now. It was a lot more common a little while ago.

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    As Redbeard said, it's to direct the airflow, otherwise up to half the air from the fan would go straight out the back of the PSU instead of working to cool it.
    Intel i7-2600k with an XSPC Raystorm water block, 4x4GB Corsair Dominator, SLi Evga-GTX560Ti-448 FTWs, Asrock Extreme4 Gen3, Crucial M4 256GB SSD, Samsung Spinpoint F3 1TB HDD, powered by a Silverstone Strider+ 850 PSU in a Silverstone TJ-07BW case.
    I'm not buying EK GPU blocks ever again. (One GPU killed)

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    Default

    Thank you. That makes sense.

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