I bought two of these to replace the broken ones in my server rack. As others have noted, they're fairly loud, especially if you're used to PC fans, but not louder than anything else in the rack, so that's not an issue in this application. The screw holes are a bit small, but after inserting the screws that were already there, I tapped in a little the first time and they work perfectly now. I connected them in parallel to an existing 120v power cord. Overall great fans for the money and they did exactly what I expected them to.
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