
Unfortunately, one of the four fans I received rattles horribly. I tried a light oil, and it is still unusable.The three fans that work properly, are indeed quiet.The output is lower than what I hoped, but I do not see this as a fault of the fans. -- the lower noise comes at the expense of lower CFM. If you intend to use this fan for 3D printer filament cooling, plan on a dual fan duct.

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