140mm to 120mm fan converter?

Nov 5, 2014
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On the top of my case I have 3 120mm fan spots (or 2 140mm), and 3 fans to go with them. Problem: My radiator from my H100i blocks the 3rd spot slightly. Luckily there are holes in my case for a 140mm fan. If I can convert that to a 120mm fan holder somehow, that would be golden. (I cannot buy anything too deep since I have my DVD/CD drive bays close underneath it.)