Fan Gaskets
Fan gaskets are designed to prevent vibrations from your PC's fans making noise inside your case. Many fans make extra noise simply from their high speeds, fan gaskets help to reduce excess noise pollution inside your PC.
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Alphacool Susurro Anti-Noise Silicone Fan Frame - 120mm - Universal (24685)
With this silicone frame 120mm fans can be fully decoupled.Learn More$4.00