30mm Air Filter Fan Guard

Fits my 30mm fan on Monoprice. Cut a piece of 1/4" thick filter about 30mm x 30mm to make a snug fit into the holder. Original file included if you need to adjust measurements. This will filter out things like animal hair, larger dust particles or prevent the fruit fly from your banana from being sucked in, ha ha! Not responsible if you use the wrong type of filter element and stress out your fan and burn it up.
FYI If you hear a change in the pitch of your fan when you install the filter, it'