Adapter Noctua NA-IS1-14 Sx2 Beige for NF-A14 PWM and others

The NA-IS1-14 Sx2 is a set of two 5 mm thick intake side spacer frames for Noctua 140x25 mm square-frame fans. Designed to replace the stock NA-AVP1 anti-vibration pads, these beige spacers create a 5 mm offset between the fan and an intake obstacle (grill, perforated plate, mesh, filter or radiator) to reduce influx turbulence. By improving airflow conditions at the fan inlet, the NA-IS1-14 can help to lower noise emissions and improve suction performance in pull-type applications.

Advantages

Offsetting the fan from the obstruction reduces turbulent air entering the fan and can lead to noticeably improved acoustic characteristics and reduced overall noise levels. The spacers can also improve fan efficiency in suction setups, enabling higher flow rates or lower noise at similar operating points. The set is supplied with the necessary anti-vibration mounts and screws for both case and radiator mounting, and is compatible with all current Noctua 140x25 mm square-frame fans.

Suitable for

• Front intake fans behind grills or perforated panels
• Intake-mounted 140 mm fans on radiators (pull configuration)
• Intakes with filters, mesh panels or other airflow obstacles

Key specifications

• Contents: 2 spacer frames (set Sx2), anti-vibration mounts, fan screws and radiator screws
• Spacer thickness: 5 mm
• Compatibility: all current Noctua 140x25 mm square-frame fans (replaces NA-AVP1 pads)
• Fan mounting hardware: 8 long self-tapping screws and 8 NA-AV3 silicone anti-vibration mounts
• Radiator screws: 8 × M3 (35 mm) and 8 × UNC 6-32 (35 mm)

How to use

For case intake installation, position the spacer between the fan and the case panel and use the supplied self-tapping screws or the NA-AV3 silicone anti-vibration mounts to fasten the assembly, sandwiching the spacer between fan and panel. For radiator-mounted intake (pull) setups, use the supplied 35 mm radiator screws (choose M3 or UNC 6-32 depending on the radiator thread) to mount the fan with the spacer in place. The spacers are intended to replace the fan’s stock NA-AVP1 pads and fit directly on current Noctua 140x25 mm square-frame fans.

Recommendations

Use the NA-IS1-14 Sx2 specifically with Noctua 140x25 mm square-frame fans; fans from other manufacturers are not supported. Choose the appropriate radiator screw thread (M3 or UNC 6-32) for your radiator, and ensure screws are tightened evenly to avoid deforming the spacer or stressing the fan frame.