You can buy a huge, foam window unit a/c dust filter from Wal-mart for about $1. They're made to be cut to fit, so they're perfect for computer fans. The only downside is that they're black, so they show dust really quickly. It's nothing that a vacuum attachment can't fix though...
Cool, how do you attach it? Just with tape? Or do you screw the fans in place and use the screws to secure it?
KingWookie87
I use push pins for PC fans.. Also, if you ever end up having to install the filters directly onto a fan, without the case screen separating them, be sure to install a fan grill between the foam and fan blades, just so the fans don't slowly tear up the filter...
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