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high-quality slim laptop cooling fan (1 piece per set) with OEM part 5F10S13901 ND65C19 is designed for Lenovo S540-13 series ultrabooks including S540-13, S540-13API 81XC, 13IML,13ARE,13ITL and Pro 13 2020. Working at DC5V, this thin centrifugal blower is specially engineered for the narrow chassis of 13-inch Lenovo ultrabook. It efficiently exhausts heat accumulated by the processor under heavy workloads, fixing high temperature, performance drop and auto shutdown problems caused by worn or stuck original fan. Precision balanced fan blades minimize vibration and noise, keeping quiet during browsing, office work and light creative tasks. The bracket, screw positions and cable connector follow OEM specifications for direct replacement, no extra trimming or modification needed. Every fan passes speed, noise and continuity inspection before delivery to ensure stable long service life.