$24.99 CAD
120 mm fan to 8-inch duct shroud for runs that have to travel: the same standard 120 mm fan face, opened to a full 8-inch collar so the first fitting is not the tightest one. Built for long, bendy runs, inline booster fans and shared trunks. Made to order in PETG in Montreal, Quebec.
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This 120 mm fan to 8-inch duct adapter is sized for the duct, not for the fan. One 120 mm fan does not need eight inches of pipe to breathe. What needs eight inches is a run that has to cross a basement, turn two or three times, feed an inline booster fan, or join a trunk that other machines already share.
Same intake face as the 6-inch version, same single continuous PETG body drawn in-house, opened to a full 8-inch collar so the first fitting in the run is not also the tightest one.
Pick this one when you already know the path is long, bent, shared or fan-assisted. Pick the 6-inch when the machine sits beside the wall it exhausts through.
Intake is the standard 120 × 120 mm fan flange on its 105 mm screw square — the pattern shared by Antminer S9-class exhaust fans, PSU fans and enclosure fans. Stock fans stay in place and the shroud sits entirely outside the chassis.
The collar takes standard 8-inch flexible or rigid duct at 203.2 mm nominal, and mates with 8-inch inline fans of the AC Infinity Cloudline S8 and T8 class.
If two 120 mm fans share one exhaust face, the Antminer S19 / S21 Dual 120 mm to 8″ Duct Shroud merges both columns properly. For 140 mm fans, go to the Whatsminer 140 mm Fan to 8″ Duct Shroud. For a short exhaust straight out of a nearby wall, the Universal Single 120 mm Fan to 6″ Duct Shroud is smaller, cheaper and entirely adequate.
Seat it over the exhaust side of the fan, band-clamp 8-inch duct onto the collar, and build the rest of the run in 8-inch: coupler, elbow, trunk, window port. Hold the diameter as far along the path as you can and step down only at the last fitting, with an 8″ to 6″ Duct Reducer if the penetration is already 6-inch. Where an inline fan is in the path, put it downstream of the shroud so the shroud only has to collect, not pull.
An 8-inch round has roughly 1.8 times the cross-sectional area of a 6-inch round, for the price of a slightly larger part. Every elbow, every metre of flexible duct and every reduction takes static pressure away from the fan, and a 120 mm fan is not carrying much to give away. This shroud is about where that budget gets spent: on the length and the turns you actually need, not on a constriction bolted to the machine before the run even starts.
The same logic decides where to reduce: late, at the wall, puts the restriction after the air has been carried. Build 8-inch, step down at the end.
| Fits | Any standard 120 × 120 mm fan flange |
|---|---|
| Intake | 1 × 120 mm fan |
| Fan screw pitch | 105 mm square (standard 120 mm fan pattern) |
| Outlet | 8″ duct collar (203.2 mm nominal) |
| Footprint | 203.2 × 203.2 × 115 mm |
| Material | PETG |
| Colour | Black or orange PETG |
| Construction | Single continuous body — no assembly, no fasteners, no glued joints |
| Design files | Open source, CC BY-SA 4.0 — free to download, use, modify and redistribute |
| Download | single_120_to_8in.zip — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | DC-SHR-120-8 |
D-Central draws these shrouds and then releases them under CC BY-SA 4.0 at the 3D models download center. Download it, change the collar, widen the base, put it on your own shop’s storefront — none of that requires buying anything here.
D-Central Technologies designed this part and open-sourced it — our drawing, our geometry, published rather than protected. Its card is at the 120 mm to 8-inch shroud entry and the file itself is single_120_to_8in.zip: STL, CC BY-SA 4.0 licence, installation and safety guide.
This page sells the finished article: printed to order in PETG, black or orange, in Montreal, Quebec, and shipped from Canada. It is the option for people who would rather have an 8-inch collar in hand than spend a night making one. The file costs nothing and always will; buying the printed part or backing D-Central’s fund page is what funds the next design in the line.
See the full D-Central shroud and ducting system for the compatibility matrix and sizing guide.
Not in the way people expect. Oversized duct costs you space and nothing else; undersized duct costs you airflow on every metre of the run. On a short straight shot the 6-inch version is the tidier pick, but as soon as the path gets long or turns more than once, the wider collar is the cheaper of the two.
That is one of the main reasons to buy this size. Shroud each machine, bring the branches together, and run one 8-inch path outside. The 8″ to Dual 6″ Y-Splitter works as a merge as readily as a split, and an 8-inch trunk holds roughly the same area as the two 6-inch branches feeding it.
Yes — the collar is standard 8-inch, which is what those inline fans are built around. Put the inline fan downstream of the shroud rather than between the shroud and the machine, so it pulls the run along instead of fighting the ASIC fan for the same air.
Close, but not identical: 8-inch is 203.2 mm against a metric 200 mm. Rather than have you force one onto the other, we cut proper metric collars — see the Antminer S19 / S21 Dual 120 mm to 200 mm Metric Duct Shroud and the Whatsminer 140 mm Fan to 200 mm Metric Duct Shroud.
At the window, as the last fitting before the air leaves. Run 8-inch for the whole length, then drop to 6-inch with an 8″ to 6″ Duct Reducer at the penetration. Reducing at the end costs far less than reducing at the machine, where every elbow downstream would then work through the constriction.
| Weight | 261 g |
|---|---|
| Dimensions | 20.32 × 20.32 × 11.5 cm |
| Colour | Black, Orange |
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Last reviewed August 19, 2026.
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