[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

120mm风扇转速控制在1000-1200RPM时噪音通常<25dBA接近静音,超过1800RPM噪音明显(>35dBA),追求静音优先选大直径低转速(140mm@800RPM优于120mm@1200RPM同风量)

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