Noctua NF-A4x20 PWM — 40×20mm Premium Quiet Fan ×4. All four fans are used, in excellent condition. Noctua NF-A4x20 PWM fan. Connector: 4-pin PWM (12V). NA-YC1 4-pin PWM splitter/Y-cable. NA-RC7 Low-Noise Adaptor (LNA).
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