Mounting kit Noctua NA-IS1-12 SX2 Black 2 pcs

The Noctua NA-IS1-12 Sx2 is a set of two 5 mm thick inlet spacer frames for Noctua 120x25 mm fans (chromax.black). Designed for suction or "pull" type installations where the fan draws air through grills, perforated plates, mesh panels, filters or radiators, these spacers offset the fan from the obstacle to reduce influx turbulence. By decreasing airflow disturbance at the intake, the NA-IS1 can improve airflow efficiency and often lower overall noise, making the fan sound quieter and more pleasant. The kit replaces the fan's stock NA-AVP1 anti-vibration pads and is compatible with all current square-frame Noctua 120x25 mm fans. The Sx2 package includes spacers, anti-vibration mounts, self-tapping fan screws and both M3 and UNC 6-32 radiator screws for straightforward installation.

Advantages

Offsetting the fan from intake obstacles reduces turbulence at the inlet, which can lead to both improved airflow performance and reduced noise emissions depending on the fan model and setup. The spacers are compatible with Noctua's current square-frame 120x25 mm fans and are supplied with anti-vibration mounts and appropriate screws for case or radiator mounting, allowing tool-free, vibration-resistant installation in many case fan applications.

Suitable for

• 120x25 mm Noctua square-frame intake fans (e.g. NF-A12x25, NF-F12, NF-P12 redux, NF-S12A)
• Front or other intake case fan positions where air is drawn through grills, filters or perforated panels
• 240 mm or similar radiators mounted in intake orientation (requires appropriate radiator screw thread selection)

Key specifications

• Set: NA-IS1-12 Sx2 (2 inlet spacer frames)
• Thickness: 5 mm each
• Compatibility: current Noctua square-frame 120x25 mm fans (not compatible with 120x15 mm slim models or non-square frames)
• Included: 2 spacers, 8 NA-AV3 anti-vibration mounts, 8 long self-tapping fan screws, 8 M3 radiator screws (35 mm), 8 UNC 6-32 radiator screws (35 mm)
• Color/variant: chromax.black
• MPN/EAN: NA-IS1-12 chromax.black Sx2 / 9010018201451

How to use

For case intake mounting, position the spacer between the fan and the case panel so the spacer offsets the fan by 5 mm from the obstacle. Fit the supplied NA-AV3 silicone anti-vibration mounts or the long self-tapping screws through the spacer holes and attach them to the fan to sandwich the spacer between fan and panel. For radiator mounting, select the appropriate radiator screws (M3 or UNC 6-32) and fasten the fan, spacer and radiator together using the supplied 35 mm screws. Replace the fan's original NA-AVP1 pads with the NA-IS1 spacers when applicable.

Recommendations

Influx turbulence varies with fan model, grill shape, mesh pattern, fan speed and overall flow resistance; results cannot be guaranteed. If unsure, test by holding the fan with no gap first and then with a 5 mm gap to estimate expected improvement. In rare cases (e.g. certain slit-type grills) adding spacers may not help or could worsen results.