Used on a non-standard PC, two fans on the top of the case as the main air intake. I have magnetic dust filters on my PC. Filters are squares with rounded corners; Screws that caused old fans to tilt up all four corners, or the filter was tilted about 10 degrees to avoid screws. The material is similar to magnetic sheets you can buy at craft stores; I was able to cut slots for the fan screws. This has actually helped the lids stay in place better. As far as how well they work, it takes about 10 seconds to clean them. Take out, wipe both sides with a clean microfiber cloth, put back. Repetition. It's way, way better than what they try to clean with a regular sponge like air filter material. Plus, it's on the outside of the case, so not only can you see when you need to clean it, but you can access it quickly and easily. 4 stars instead of 5 because the dust cover is not "straight" due to the fan mounting screws. If the manufacturer or reseller could add recesses for the screws the product would be perfect. Even if they don't, this is an easy mod to make notches yourself.
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