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40mm axial cooling fan is a highquality dropin replacement for KDE1204PFV3. Optimized for 1U heatsink and spaceconstrained hardware, it runs at DC 12V with 0.8W power output and reaches 3500RPM rotation speed. It generates focused airflow to expel trapped heat from 1U servers, network hardware and other compact electronic devices. Equipped with standard 3pin interface, it supports simple connection without extra modification. Wellbalanced fan blades suppress vibration to keep relatively quiet operation. Originalspec mounting holes allow fast replacement of failed stock fans. Please check fan dimension, voltage and power parameters before purchase to guarantee compatibility.