Custom magnetic filter
1 Get materials
You may want a more elaborate design than a simple fan filter, while other filters might not quite fit over your intended vent hole. If you want to make a custom filter, you can use magnetic tape and PC case mesh sheet.
2 Cut mesh to size
The mesh is available in large sheet form and is relatively cheap. Start by measuring the size of the hole you need to cover. Mark up the mesh, then use a sturdy pair of scissors to cut it to size.
3 Cut magnetic strip to size
The magnetic strip comes in a variety of lengths and widths. We’ve used 10mm-wide adhesive strip, as this width sticks well to the mesh.
4 Apply to mesh
Press the strip firmly onto the mesh. If yours doesn’t stick securely for whatever reason, you can use a small amount of epoxy or glue from a glue gun to secure it onto the top side.
Tights - the cheapest option
1 Cut to size
Tights can make cost-effective filters if there are old pairs going free at home. Cut out a section that’s large enough to cover the fan and reach behind to the rear fan-mount holes where you’ll screw it in place. This allows you to mount the fan as an intake.
2 Screw to fans
Pass fan screws through the tights with thin washers to avoid snagging. Stretch the tights to each corner to prevent sagging. Install the fan in your case’s front using the free screw holes. For a neater, fixed filter, stick the tights to the fan’s sides with a glue gun.