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For no good reason, my house generates more dust than many dirt track rally car races.

I have a similar problem here, but the inside of my computer case is quite dust-free. I purchased a Lian-Li with sound dampener already installed and, yes, a dust filter in front of the intake fans. I recently replaced the fans with Zalmans, using the provided resistors and Fan Mate to make them quiet.

Noise was my concern when I bought the case, but not seeing any dust collect inside or on the fans is a nice bonus. All I have to do is rinse the filter occasionally.