Dust Filter PC 120mm for Computer Cooler/PSU/Routers Nylon 80 Mesh, Magnetic Frame PC Fan Dust Mesh Cooler Filter Dustproof Computer Fan Grills (Nylon, 120 * 120mm, 2pcs, Black)

These magnetic dust covers work well. the magnets keep it in place and you can also screw them in place as well.

Really inexpensive considering I recall having purchased filters nearly identical to these from a premium brand at a premium price.Airflow naturally gets restricted a little when you install these on a PC, but I dremeled out the fan hole's steel mesh on my PC case to unrestrict a little airflow, so...? I suppose it cancels out.You may find that one or two of the sides of these won't lay flat on your PC case. At least for me, this was my experience when placing it on the bottom fan (where my case is made of aluminum and not steel). It's not impossible to get it to lay flat, you just will have to loosen all four of your fan screws a little, then either play finger twister with your hand to hold it down while tightening the screws, OR use tape to aid installation. Experiment with tightening screws round robin, or perhaps tighten one corner then the opposite corner immediately after. There's a trick to it, and it's not too difficult to figure out. You'll see as you try. The key is just to get all screws 80% tightened so the filter has no tension dragging it anywhere when you start.As for the filter itself, it's premium nylon mesh. Doesn't get any better than this if that's what you're after.

A must have for computer systems in a dusty, pet heavy home to keep dust, hair and dander down. Cleaning is warm water and air dry and they attach with the 120mm fan screws making it easy to clean and replace

Filter well, however, the mesh does not have enough tension, and cannot be mounted directly to the intake fan, as it will interfere with the fan blade movement.

Perfect fit - Good quality

Fine nylon mesh is way better than those PVC type mesh with 0.8mm holes. Better airflow and less restrictive.Magnetic isn't crazy strong. Just like your typical refrigerator magnets. Enough to hold on to metal surfaces. Use it on my 45Drive HL15 case.I bought both 120mm & 140mm. Corners of the 120mm is more beveled. The 140mm maybe due to Q/C felt lower quality, but functionally works the same.

I wanted to add some ventilation to my computer. These work nicely and cover the hole I cut out. The magnet side is great since I didn't have to bolt them on. I can also remove as needed for cleaning.

works great on my open air pc build