Velocity stack for Noctua 40mm fan NFA4x10
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Velocity stack for Noctua 40mm fan NF-A4x10

Very likely useless Not based on any science beyond it looks cool much like most fan ducts models ...

similar models —

Velocity stack for Noctua 40mm fan NF-A4x10 alternatives
40mm Fan Duct
Jack_Tay