MoKo 120 x 120mm PC Case Magnetic Dust Mesh Filter, 0.5mm PVC Mesh Hole Computer Cooler Fan, Magnetic Frame Dustproof Cover Grill for Computer PC Case - 4PCS

The 120mm 0.5mm filters work great. Might be a little restrictive on airflow but I have a mesh case so it combines really well with my setup. It also looks good with the rounded corners. Magnets are stick fairly well too. The 1.0mm ones might be a little too big depending on your use case so make sure to check what's best for your case.

My system is set up with 1 140mm fan at the front as intak, 120 at the back right past my cooler and a 140 at the top above the cooler both exhausting. My PSU is also exhaust. I had three spots for 140's that were empty and the negative pressure was pulling dust in the machine and I had to clean it often. Bought these and used them to cover the 3 openings that aren't being used since the exhaust was pulling in dust. The magnets are more than strong enough and the screen will keep dust out but the mesh is not so small that it will impede air flow being sucked into the case passively. The mesh is very flexible and the 140 size I purchased worked perfectly. Now I can just take the screens off and blow them out periodically instead of bringing my computer out on to the porch to blow it out.

Easy to use, and they work great

Work good

I've been using these on my SAMA IM01 now for over 6 months at this point and I don't have too many complaints. I find the magnet strength to be satisfactory. It's not choking off the airflow for my PSU, they couldn't be easier to install, and they work with both of my metal cases. Overall I'd buy it again.

The magnets do not stick very well, and you have to arrange them in particular ways as the polarity doesn't match consistently. They definitely weren't strong enough to stick to the metal fan screws

These are great, you get 4 in a pack and you can easily cut them if you want to cover more narrow vents.

Magnet works, look nice and air flow is good.