This article covers Noctua NA-FD1 ファンダクトキット NH-L9i及びNH-L9aシリーズクーラー専用.

Overview

The Noctua NA-FD1 is a dedicated fan duct kit designed exclusively for the NH-L9i and NH-L9a series low-profile CPU coolers. It fills the gap between the cooler fan and a perforated side panel in SFF cases, allowing the cooler to draw fresh air directly from outside the chassis. The modular EVA foam spacer system adjusts from 5mm to 45mm in 1mm increments, making it ideal for popular SFF enclosures like the Dan A4-SFX and Loque Ghost S1. Installation is tool-free: simply place the spacer between the fan and the panel and secure it with the included hardware. Users can expect CPU temperature reductions of up to 5°C or more, along with reduced turbulence noise. Backed by Noctua's renowned quality and long-term spare parts availability.

Connectivity & Compatibility

The NA-FD1 is a purely mechanical spacer with no electrical connections. It is compatible with Noctua NH-L9i (including chromax.black), NH-L9i-17xx, NH-L9a, NH-L9a-AM5, and NH-L9a-AM4 coolers. The kit works best with SFF cases that have a vented side panel directly above the CPU cooler area. The EVA foam material dampens vibrations and is easy to trim if needed. It is designed primarily for cases like the Dan A4-SFX and Loque Ghost S1, but can be used with any similar layout. The adjustment range of 5-45mm covers most common gap scenarios.

Product Info

Released around 2021, the NA-FD1 is priced at approximately ¥1,299 on Japan (as of May 2026). Noctua provides a 6-year EU spare parts availability period. The package includes the foam spacer blocks, mounting screws, and a quick-start guide. Market positioning is a niche accessory for SFF builders who already own a compatible Noctua low-profile cooler and want to maximize thermal performance and acoustic comfort. Few alternatives exist, making this a unique, purpose-built solution.

Best Use Cases

Ideal for SFF enthusiasts building in ultra-compact cases like the Dan A4-SFX, Loque Ghost S1, or similar chassis with top-mounted vented panels. Users who notice high CPU temperatures or fan turbulence noise due to the fan being too close to the panel will benefit significantly. Also suitable for those upgrading to a Noctua low-profile cooler and wanting to ensure optimal airflow clearance from day one. The duct kit is a cost-effective way to improve thermals without replacing the entire cooling system.

Product Disclosure (Amazon)

  • Manufacturer: Noctua
  • ASIN: B09HKXRQCD
  • Note: This article covers a manufacturer-made product based on Amazon listing details.