Supermicro Lüfter FAN-0216L4-2 40x40x56mm Counterrotating

In dense server racks where every millimetre counts, the Supermicro FAN-0216L4-2 delivers focused airflow where standard fans fall short. This 40 mm counter-rotating axial fan is engineered for high-static-pressure scenarios, pushing air through tight heatsink fins and chassis vents with remarkable efficiency. Its dual impeller design, spinning in opposite directions, straightens and accelerates the airstream, reducing turbulence and boosting cooling performance for CPUs and critical components in 1U and blade servers.

Key specifications

• Dimensions: 40 x 40 x 56 mm (L x W x H)
• Type: Axial fan with counter-rotating impellers
• Rated voltage: 12 V DC
• Connector: 4-pin PWM for automatic speed control
• Bearing: Dual ball bearing for long life and high reliability
• Expected lifespan (MTTF): >70,000 hours
• Material: High-grade plastic
• Mounting: Standard 40 mm fan screw holes
• Application: Server chassis cooling, CPU heatsink cooling
• Manufacturer: Supermicro

Why choose it

The counter-rotating design is the standout feature: by stacking two impellers that spin in opposite directions, this fan generates higher pressure and more directed airflow than a single fan of the same size. That makes it ideal for overcoming the resistance of dense heatsinks or restrictive server layouts. The dual ball bearing construction ensures stable operation even at high temperatures, and the PWM control lets your server adjust fan speed based on thermal load, balancing cooling and noise. With a lifespan exceeding 70,000 hours, it is built for 24/7 operation in demanding data centre environments.

Ideal use cases

• Cooling high-performance CPUs in 1U and 2U rack servers
• Providing targeted airflow to memory modules and chipsets
• Replacing failed or noisy fans in Supermicro chassis and other compatible systems
• Enhancing cooling in compact workstations or network appliances

Good to know

This fan is a genuine Supermicro part, ensuring exact fit and performance in Supermicro server chassis. It uses a standard 4-pin PWM connector, so it can be controlled by most server motherboards. Installation is straightforward with the standard 40 mm mounting holes, but note the 56 mm thickness—verify that your chassis has enough clearance. For best results, pair it with a compatible heatsink or use it as a direct replacement in systems originally equipped with this model.