What size are these.? 140 mm 120 mm etc?

They are for 92 mm fans -- like on the NH-9Li, NH-9La, or NH-9x65/

Is there a model for 120mm fans?

The Fan Duct Kit was specifically for the NH-L9 CPU Coolers which are low profile. Haven't seen a 120mm version. The Fan Duct works very well on the NH-L9 coolers, sealing out warm air from inside the case and only allowing the cooler outside air in. I have a tiny AMD build in a 4 liter case, and the Duct kit helps keep CPU Temps in the 95 degrees (39C)

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NA-FD1, Fan Duct Kit for NH-L9i and NH-L9a Series CPU Coolers (Black)

Product ID: 386453296

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Details

Brand
Noctua
Colour
Black
Number of channels
8
Special features
Fresh Air
Water resistance level
Not Water

📏Adjustable 5-45mm spacing

🖤Sleek black chromax design

🌡️Up to 5°C cooler temps

Description

🖤 Cool your compact rig like a pro — no compromises, just chill.

SLEEK STEALTH STYLE - Matte black chromax finish blends seamlessly with premium NH-L9i/a coolers
CUSTOM FIT FLEXIBILITY - Modular EVA foam spacers adjustable in 1mm increments for perfect SFF case compatibility
PRECISION COOLING BOOST - Bridges fan to case for fresh air intake, dropping CPU temps by 5°C+
OPTIMIZED FOR SFF BUILDS - Tailored for compact cases like Dan A4-SFX and Loque Ghost S1, maximizing airflow in tight spaces
LIGHTWEIGHT EASY INSTALL - Weighs just 54g and installs effortlessly without compromising your build aesthetics

The Noctua NA-FD1 Fan Duct Kit enhances cooling efficiency for NH-L9i and NH-L9a series CPU coolers by channeling fresh air directly from outside the case. Its modular EVA foam spacers offer precise 5 to 45mm adjustable spacing, ideal for small form factor cases such as Dan A4-SFX and Loque Ghost S1. Finished in sleek chromax black, it combines performance with style while weighing only 54 grams.

Specifications

Brand	Noctua
Product Dimensions	12 x 9.9 x 4.8 cm; 54 g
Batteries	12V batteries required.
Item model number	NA-FD1
Manufacturer	NOCTUA
Color	Black
Are Batteries Included	No
Number of Lithium Metal Cells	1
Item Weight	54 g

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