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Main image of Noctua NA-IS1-12 chromax.black Sx2, Inlet Side Spacers for 120mm Fans (Black)

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Noctua NA-IS1-12 chromax.black Sx2, Inlet Side Spacers for 120mm Fans (Black)

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Introducing a 5mm offset, NA-IS1-12 12cm inlet spacers can reduce influx turbulences in suction type applications where fans draw air through perforated panels or other obstacles in close proximity
Simple but effective: In many situations, reducing influx turbulence can lead to significantly improved airflow performance as well as lower noise levels and more pleasant sound signatures
Ideal for PC case intake fans, pull fans on water cooling radiators or other situations where fans draw air through grills, perforated panels, punctuated sheets, mesh structures, filters, etc.
Compatible with all current Noctua 120x25mm fans such as the popular NF-A12x25, NF-F12, NF-P12 redux or NF-S12A series, not compatible with NF-A12x15 or fans from other manufacturers
Sx2 set includes two inlet spacers, 8x NA-AV3 anti-vibration mounts, 8x screws for case fan installation, 8x screws for radiators with M3 threads and 8x screws for radiators with UNC 6-32 threads

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The NA-IS1-12 Sx2 is a set of two 5mm thick intake side spacer frames for Noctua 120x25mm fans that can help to improve both acoustics and performance in suction or "pull" type applications where the fan draws air through obstacles such as grills, perforated plates, mesh panels, filters or radiators. By offsetting the fan from the obstacle, the NA-IS1 inlet spacer reduces influx turbulences, which can, depending on the application and fan model, not only improve airflow but also significantly reduce overall noise levels and make the fan sound more pleasant to the ear. Designed to replace the fan's stock NA-AVP1 anti-vibration pads, the NA-IS1-12 are compatible with all current square-frame Noctua 120x25mm fans and extremely straightforward to install. In sum, the NA-IS1-12 Sx2 set is a simple yet highly effective fine-tuning measure for suction type applications where a reduction of influx turbulence can lead to improved airflow and acoustics.

More airflow, less noise

Reducing influx turbulences doesn't only improve acoustics, it also helps fans to operate more efficiently from an airflow performance point of view. In many suction-type applications, using inlet spacers can therefore enable fans to achieve both higher flow rates and lower noise emissions.

Improving suction acoustics

Suction applications where fans draw air through obstacles such as grills or perforated panels are notoriously challenging acoustically due to the turbulences caused by these obstacles. Introducing a 5mm off-set between the fan and the obstacle, the NA-IS1 spacers can reduce these turbulences, which often improves noise levels and/or noise profiles significantly.

Compatible with all current Noctua 120x25mm fans

Replacing the fan's stock NA-AVP1 anti-vibration pads, the NA-IS1-12 are compatible with all current Noctua square-frame 120x25mm fans such as the popular NF-A12x25, NF-F12, NF-P12 redux or NF-S12A series. The slim NF-A12x15 or fans from other manufacturers are not supported.

Anti-vibration mounts and fan screws

For use with case intake fans, the NA-IS1-12 Sx2 contains eight long self-tapping fan screws and eight NA-AV3 silicone anti-vibration mounts for tool-free, vibration-proof installation. Both the screws and the anti-vibration mounts simply go through the holes in the spacer and attach to the fan, sandwiching the spacer between the fan and the case.

Scope of Delivery

2x NA-IS1-12 chromax.black inlet spacers for 120mm fans
8x NA-AV3 chromax.black anti-vibration mounts
8x NM-SFS4-BK long fan screws
8x NM-SFS5-BK radiator screws (M3)
8x NM-SFS6-BK radiator screws (UNC)

Please note:

As influx turbulences vary between different fans models and setups, it is not possible to reliably predict how much of an improvement adding inlet spacers will make. Please see our performance guidelines for further information.

Products	NA-IS1-12 Sx2	NA-IS1-12 Sx2 chromax.black	NA-IS1-14 Sx2	NA-IS1-14 Sx2 chromax.black
Colour	Beige & Brown	Black	Beige & Brown	Black
Quantity	x2	x2	x2	x2
Fan Compatibility	Noctua 120x25mm square fans	Noctua 120x25mm square fans	Noctua 140x25mm square fans	Noctua 140x25mm square fans

The NA-IS1-12 Sx2 is a set of two 5mm thick intake side spacer frames for Noctua 120x25mm fans that can help to improve both acoustics and performance in suction or pull type applications where the fan draws air through obstacles such as grills, perforated plates, mesh panels, filters or radiators. By offsetting the fan from the obstacle, the NA-IS1 inlet spacer reduces influx turbulences, which can, depending on the application and fan model, not only improve airflow but also significantly reduce overall noise levels and make the fan sound more pleasant to the ear.

Designed to replace the fans stock NA-AVP1 anti-vibration pads, the NA-IS1-12 are compatible with all current square-frame Noctua 120x25mm fans and extremely straightforward to install: For case fan applications, either the supplied self-tapping screws or the included NA-AV3 anti-vibration mounts can be used to sandwich the spacer between the fan and the case panel. For radiator mounting, both M3 and UNC 6-32 screws are supplied. In sum, the NA-IS1-12 Sx2 set is a simple yet highly effective fine-tuning measure for suction type applications where a reduction of influx turbulence can lead to improved airflow and acoustics. The chromax. black variant is a perfect match for black chromax or industrialPPC line fans.
Caution: As influx turbulences vary between different fans models and setups (e. g. different fan speeds, grill shapes, mesh patterns, overall flow resistance, etc. ), it is not possible to reliably predict how much of an improvement adding inlet spacers will make. While the improvements are significant in most configurations, there sometimes may be little to no improvements and, in rare situations such as with particular slit-type grills, adding spacers may even lead to undesirable results with particular fan models. Please see our performance guidelines for further information.

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First Listed on Newegg	December 16, 2022

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The Noctua NA-IS1-12 chromax.black Sx2 is a pair of 5mm inlet spacers for Noctua 120x25mm fans, designed for PC builders who want to reduce turbulence when intake air passes through a nearby mesh, grille, filter, or perforated panel, potentially improving airflow and acoustics.

Recommended For

PC builders using compatible Noctua 120×25 mm fans as intake behind a case mesh, grille, filter, or perforated panel who want to reduce turbulence-related noise and potentially improve airflow.
Builders running compatible 120 mm fans in pull-style radiator setups, especially front-mounted radiators drawing air through a grille or other nearby obstruction.
Owners of a Fractal Design North configuring the front-most top fan as intake, where Noctua identifies the case strut near that position as a source of intake turbulence.
PC enthusiasts fine-tuning a noisy or airflow-restricted intake and willing to test whether spacing the fan from the nearby obstacle improves their particular setup.

Real-World Use Scenarios

If a 120 mm Noctua intake fan makes a high-pitched or rough airflow sound while drawing air through a nearby perforated panel, grille, or mesh, adding the spacer can reduce turbulence and make the sound less prominent; the change depends on the fan and panel.
In a Fractal Design North build, the front-most top fan can be configured as an intake to feed fresh air toward the CPU cooler. Noctua recommends an NA-IS1-12 at that position to reduce turbulence from the case’s crossing support strut, helping the system run its fans more quietly at similar CPU temperatures in its tested setup.
For a 120 mm fan pulling air through a water-cooling radiator, the spacer can help reduce intake turbulence and may improve airflow or soften the noise. Noctua’s tests found benefits for many tested 120 mm radiator setups, but results varied by fan model, so it is best treated as a tuning option rather than a guaranteed cooling upgrade.
When a case intake fan sits close behind a dust filter or restrictive front panel, the spacer can create separation from that obstacle and may reduce turbulence-related noise while helping airflow. It is most relevant when the fan is drawing air through the obstruction; it is unlikely to address noise caused by an unrelated source.

Item#: 9SIAADYJB31470