A Swedish company called Fractal Design offers custom systems with some interesting features.  Their Define R2 ships with a feature called ModuVent, which are pieces of bitumen in either 120mm or 140mm squares which you can install into unused fan holes to both reduce noise and stop dust from coming into your system.  Since you can fit up to 7 fans in the system you can choose to make it either very quiet or fill all the holes and get a ton of airflow.  You may not get out to Sweden often, but still drop by MektuMods to see what you are missing out on.

“A while ago I saw a case called Define R2 from a Swedish manufacturer, Fractal Design. I thought the specs were great and the price was very reasonable, if it was able to deliver what it promised. Now we will find out!”

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