Nidec 4056 25W 12V Dual Ball Bearing Cooling Fan - 40mm Server Fan

The Nidec 4056 is a 25W, 12V DC cooling fan built for high-demand thermal management in servers, workstations, and dense electronic enclosures. Its distinctive 40mm × 40mm × 56mm frame houses two counter-rotating rotors—a front fan rated at approximately 23,300 RPM and a rear fan at approximately 24,200 RPM—which together generate strong static pressure and airflow in a compact footprint. The dual ball bearing construction supports continuous operation and long service life, making this 25W 12V cooling fan suitable for 24/7 server cooling and other reliability-critical applications. The fan draws roughly 1.9–2.1A at 12V, and its black housing and standard 40mm mounting pattern allow drop-in replacement in many 4cm server fan trays. Because the rotors spin in opposite directions, the design reduces swirl and improves pressure delivery compared with a single-rotor fan of the same size. Whether the goal is to replace a failed server fan, upgrade cooling in a network appliance, or add high-flow ventilation to a compact chassis, this Nidec cooling fan delivers a proven, durable solution.

Nidec 4056 fan Application

1. Cooling rack-mounted servers, blade servers, and storage arrays with 40mm fan bays.
2. Thermal management in network switches, telecom equipment, and industrial computers.
3. Continuous-duty cooling in data centers, lab instruments, and power electronics.
4. High-airflow replacement for standard 40mm axial fans in small-form-factor PCs and consoles.
5. General electronics cooling where a compact 25W 12V cooling fan is required.

Nidec 4056 fan Specifications

1. Brand: Nidec
2. Series: 4056
3. Voltage: 12V DC
4. Power: 25W
5. Current: 1.91A / 2.10A (alternate distributor listing for a 25W variant)
6. Size: 40mm × 40mm × 56mm
7. Bearing type: Double ball bearing
8. Rotor configuration: Dual counter-rotating
9. Front fan speed: approximately 23,300 RPM
10. Rear fan speed: approximately 24,200 RPM
11. Color: Black
12. Package includes: 1 × Nidec 12V cooling fan