24V version of Noctuas award-winning quiet 40x10mm fan, ideal upgrade/replacement 4cm fan for 3D printing (hot end or part cooling) and other 24V applications 5000rpm max., 4-pin PWM connector for automatic speed control via 4-pin PWM fan headers (maximum airflow performance when required, near-silent at lower speeds) NA-AC9 adaptor cable for popular 3D printers with JST XHP-2 2.5mm headers (e.g. Creality Ender 3 & CR-10, Anycubic Mega), ideal to improve printing performance and quietness of operation Includes anti-vibration mounts, fan screws, extension cable, Low-Noise Adaptor (LNA), NA-AC9 adaptor and OmniJoin adaptor set for connecting the fan to proprietary fan headers Trusted Noctua quality with premium-grade SSO2 bearing (MTTF > 150,000 h), safety certifications from UL and TÜV, protected against reverse polarity, over voltage and over current (short-circuits)