You get a dozen screws and a hex key to install them. There are no instructions telling you that 4 are different from the others - these are the ones that assemble the case - the rest assemble the fans. See the Revain image for how to connect the fans - there are no instructions. If you think the fans are blowing in the wrong direction (also, there's no indication which direction is right), you need to flip the fans. Switching power back to these DC fans does not change their direction. This will kill her. Instructions for installing thermal pads are also helpful. Really nice case for your Raspberry Pi 4 after installation. A quarter sheet of paper probably won't wipe out profits, but it will result in happier customers. Be careful.
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