10 Best 40mm Fans for 2025

Noctua

• Premium quiet fan, 40x40x10 mm, 12V, 3-pin Molex, 4500/3700 RPM, max. 17.9 dB(A), >150,000 h MTTF
• Award-winning 40x10mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
• Ideal replacement for noisy or broken 12V 4cm fans in 3D printers, DVRs, NAS, switches, routers, other network and storage devices, etc
• 3-pin 12V FLX version can be run 4500 or 3700 rpm using the supplied Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation
• Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Gelid Solutions

• HIGHER AIRFLOW: The Silent 4 is designed to maximize the airflow thanks to its Optimized Fan Blades while no increasing the noise level.
• HYDRO DYNAMIC BEARING: GELID’s HYDRO DYNAMIC BEARING Extends the Service Life of the Silent 4 to 50000 h MTTF at 40° C
• IMPROVED PERFORMANCE: The Silent 4 enjoys a 4200 RPM, an Air Flow of 7.65 CMH and a noise level of 18.9 dBA. This can be achieve thanks to the superior design from GELID.
• WARRANTY: GELID stands behind its products, that is why We offer 3 Years warranty for all our Silent fans.

WINSINN

• ✔️️Hydraulic Bearings 4010 Fan - High Speed version
• ✔️High quality Hydraulic bearings, Better than Oil bearings, More stable and Long life, suitable for continuous work. The life expectancy is about 45,000 hours.
• ✔️️Rated voltage: DC 24V
• ✔️️Size: 40x40x10mm
• ✔️Made by WINSINN.

NoiseBlocker

• Fans
• Air Cooling

Noctua

• Premium quiet fan, 40x40x20 mm, 12V, 3-pin Molex, 5000/4400/370 RPM, max. 14.9 dB(A), >150,000 h MTTF
• Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
• 40x20mm size ideal for 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
• Comes with free anti vibration brackets, fan screws, Extension Cable and Omnijoin adaptor kit to to use with embedded proprietary connections
• 3-pin FLX version provides 5000/4400/3700rpm speed settings via Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation
• Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Noctua

• Premium quiet fan, 40x40x10 mm, 5V, 3-pin Molex, 4500 RPM, 17.9 dB(A), >150,000 h MTTF
• Award-winning 40x10mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
• Ideal replacement for noisy or broken 5V 4cm fans in 3D printers, DVRs, NAS, switches, routers, other network and storage devices, etc.
• 3-pin 5V version with 4500rpm, not to be used at 12V (such as in PC environments)
• Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Noctua

• Premium quiet fan, 40x40x10 mm, 12V, 4-pin PWM, max. 5000 RPM, max. 12.9 dB(A), >150,000 h MTTF
• Award-winning 40x10mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
• Ideal replacement for noisy or broken 12V 4cm fans in 3D printers, DVRs, NAS, switches, routers, other network and storage devices, etc.
• 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, broad 1000-5000rpm speed range (3700rpm max. with supplied Low-Noise Adaptor)
• Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Noctua

• Premium quiet fan, 40x40x20 mm, 12V, 4-pin PWM, max. 5000 RPM, max. 14.9 dB(A), >150,000 h MTTF
• Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
• 40x20mm size ideal for 1U servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
• 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 5000rpm maximum speed (4400rpm with supplied Low-Noise Adaptor)
• Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Makerfire

• ❆ Note: Voltage: DC 12V, Working Current: 0.08A, Motor Power: 0.96 W, Temperature of usage environment: -10℃ to +70℃. When you use them, pls don't exceed this range!! 2. If the noise is too big and you want the fan to be muted, please connect a 47 ohm resistor in series with the circuit to adjust the voltage to 12 V 0.05 A. 3. Any problems, pls click "seamuing" and choose "Ask A Question" to email us! We will offer you satisfied solution!
• ❆ With high performance, long life and low noise. Noise: 26 dBA; Certification: CE,UL,CUL.
• ❆ Bearing is high precision: Oil bearing: 30000 hours; Double roller bearing: 50000 hours.
• ❆ Used for cooling on hot end, 3D Printers, DVR or other cooling needs. Air Volume: 5.75±10% CFM; Rotational speed: 5600±10% (r/min); Wind blade diameter: 36 mm.
• ❆ 40mm Fan - Size: 40 mm x 40 mm x 10 mm (1.57 inch x 1.57 inch x 0.39 inch); Cable length: 280 mm (11.02 inch). Connector: 2.54-2P Connector.

IBest

• Dedicated Cooling Fan for Jetson Nano
• Category: Jetson Nano cooling fan
• Connector: 3PIN reverse-proof connector
• Voltage: 5v
• Dimensions: 40mm×40mm×10mm