Noctua fan spacers Inlet Side Spacers - 2pcs pack 140x25 mm Fans - NA-IS1-14-Sx2

This is a set of Noctua Inlet Side Spacers NA-IS1-14-Sx2 for 140x25 mm fans – a small but meaningful upgrade for airflow in the case or on the radiator. Their purpose is to improve the way air enters the fan by reducing turbulence and "choking" when close to surfaces. The result is smoother airflow and often – lower noise at the same RPM. If you have already invested in quality fans, such an accessory allows you to squeeze a bit more efficiency out of them.

What you get

With this set, you get two spacers for 140x25 mm fans, which are mounted on the inlet side. The distance between the fan frame and the surface in front of it helps reduce vortices and "whistling" that often occurs when the fan is tightly next to a grille, filter, or radiator. This can mean quieter operation at the same airflow or the same noise at lower RPM. The idea is simple – to give the fan more "breathing room" without changing the entire cooling setup.

• Set of 2 spacers, which is enough for a pair of 140 mm fans at the front or bottom of the case.
• Compatible with 140x25 mm fans, i.e. the standard 140 mm size most commonly used for intake positions and radiators.
• Mounting on the inlet side (inlet side) to optimize suction and reduce turbulent noise near grilles and filters.
• Suitable for finer tuning of airflow in cases with limited space at the front or with denser mesh panels.
• Accessory from Noctua, aimed at people who are already looking for more detailed control over noise and cooling system behavior.
• A practical option if you want to reduce system noise without changing fans or rearranging the entire build.

Who it is suitable for

These spacers are for enthusiasts who already have good fans and want to optimize airflow and acoustics a bit more. They are especially useful if your fans are very close to the front panel, filter, or radiator and you notice additional noise or "whooshing". They are not mandatory for every build, but if you are meticulous about noise and details in cooling, this is exactly the type of small additions you will appreciate.

The most meaningful thing here is that with a small accessory from Noctua, you can improve the behavior of already installed 140 mm fans without changing hardware or making serious compromises with the arrangement of components.