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Noctua NA-FD1, Fan Duct Kit for NH-L9i and NH-L9a Series CPU Coolers (Black)
- Bridges the gap between the fan and perforated case panels in order to enable the cooler to draw in fresh air from the outside for improved cooling performance (up to 5°C and more)
- Modular system made from EVA foam spacers, adjustable from 5 to 45mm in 1mm increments, ideal for popular SFF cases (e.g. Dan A4-SFX, Loque Ghost S1)
- Compatible with NH-L9i (chromax.black), NH-L9i-17xx (chromax.black) NH-L9a, NH-L9a-AM5 (chromax.black) and NH-L9a-AM4 (chromax.black)
- Easy, straightforward installation procedure
- Trusted Noctua quality backed up by a 6-year manufacturers warranty
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Overview
Specs
Reviews (2)
The NA-FD1 fan duct kit makes it possible to significantly improve the performance of Noctua NH-L9i and NH-L9a series CPU coolers in Small Form Factor (SFF) environments where there is a gap of 5mm or more (up to 45mm) between the cooler and a perforated top or side panel. Bridging this gap, the duct prevents the cooler from taking in hot air from the interior and enables it to draw in fresh air from the outside through the perforated panel, which can, depending on the setup, improve CPU temperatures by as much as 5°C or more.
As the duct is assembled from EVA foam spacers of different thicknesses, it is fully modular and can be adjusted in 1mm increments from 5mm to 45mm height, in order to fit various different cases and configurations. In short, the NA-FD1 is a simple yet smart, flexible, and cost-effective way of boosting the efficiency of NH-L9 series coolers!
As the duct is assembled from EVA foam spacers of different thicknesses, it is fully modular and can be adjusted in 1mm increments from 5mm to 45mm height, in order to fit various different cases and configurations. In short, the NA-FD1 is a simple yet smart, flexible, and cost-effective way of boosting the efficiency of NH-L9 series coolers!
Warranty & Returns
Warranty, Returns, And Additional Information
Return Policies*
- Return for refund within: 30 days
- Return for replacement within: non-replaceable
- This item is covered by Noctua Cooling Solutions Return Policy
- *Subject to applicable law
Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.
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The Noctua NA-FD1 is an adjustable fan duct kit for compatible NH-L9i and NH-L9a CPU coolers, suited to small-form-factor PC builders who want the cooler to draw fresh air through a perforated case panel; depending on the setup, it can improve CPU temperatures by up to 5°C or more.
Recommended For
- Small-form-factor PC builders using a compatible NH-L9i or NH-L9a cooler, with a perforated case panel and a 5–45 mm gap, who want the cooler to draw in outside air instead of warmer air around the socket.
- Compact PC owners who run sustained CPU-heavy workloads and want to reduce temperatures without replacing their NH-L9 cooler; independent tests reported roughly 3–5°C lower temperatures in specific setups when the duct filled the gap.
- Builders of tight ITX or HTPC systems whose cooler sits below a vented side or top panel and pulls in heat trapped near the CPU socket; the adjustable foam spacers let them match the duct to the case clearance.
Real-World Use Scenarios
- In a compact ITX case with an NH-L9i or NH-L9a close to a perforated panel, a builder can use the NA-FD1 to route outside air to the cooler; testing found CPU temperatures about 3–5°C lower in some configurations, though results depend on the case and duct fit.
- When a small-form-factor PC runs sustained CPU-heavy tasks, such as repeated renders or benchmarks, the duct can help the NH-L9 draw cooler outside air instead of recirculating warm air around the socket; one long Cinebench test reported a 3.1°C temperature reduction.
- In a slim build where the cooler fan sits very close to a vented panel, a user bothered by high-pitched intake turbulence can add the duct to create more space for the fan to draw air; Noctua says this can produce a smoother sound, though the audible change will vary by build.
- If a builder moves an NH-L9 system between compatible compact cases, they can restack the NA-FD1 spacers to match the new cooler-to-panel gap, provided the panel is perforated and aligned with the cooler intake.
- When a compact PC is running warmer than desired, an owner can try the NA-FD1 as a small airflow improvement before changing the whole cooling setup; expect a configuration-dependent temperature benefit, not a replacement for a larger cooler when more cooling capacity is needed.