$41.99 CAD
Venturi-throat shroud for the Antminer S19 and standard S21: dual 120 mm fans into 6-inch duct through a smooth contraction rather than a hard step, so the flow stays attached. One-piece PETG, made to order in Montreal, Quebec.
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This venturi shroud takes the Antminer S19 and standard S21 exhaust pair into 6-inch duct through a contracting throat instead of a flat step. Same fans in, same 6-inch duct out, a different shape in between: it is the airflow-first member of the dual 120 mm family.
Air does not like corners. Where a plenum drops straight to a collar, the stream cannot follow the sudden turn, so it lets go of the wall and rolls into a vortex just inside the duct. That separated ring is dead area: the duct is 6 inches wide but the moving column inside it is not. A venturi throat curves the wall in and then releases it, giving the flow something to stay attached to.
Intake is the rear 120 mm fan pair on the Antminer S19, S19 Pro, S19j, S19j Pro, S19k Pro, S19 XP and the standard S21, on stock fan screws. Outlet is a standard 6-inch collar for ordinary flexible or rigid duct, in the same 250 x 165 x 152.4 mm envelope as the plain body, so it drops into the same space.
Take this one when the duct downstream is already working hard: a long line, several bends, a shared trunk, or an inline fan doing part of the pull. If your run is short and straight, the throat buys you something you will not need, and the plain Antminer S19 / S21 Dual 120 mm to 6" Duct Shroud is the sensible part. It is not for the S21 Pro, S21+ or S21 XP, which run a 140 mm fan pair and need the Antminer S21 Pro Dual 140 mm to 6" Duct Shroud. The same throat on a broader base is the Antminer S19 / S21 Dual 120 mm to 6-Inch Venturi Shroud — Wide Base.
Install it exactly as you would the plain shroud: seat it over the fan pair, slide 6-inch duct over the collar, tighten a band clamp. Nothing about the machine changes and no adapter is needed at the duct end. The only decision the venturi asks of you is made before you order, not during the install.
A contraction is the one transition shape that accelerating air handles cleanly. As the section narrows, the flow speeds up and stays pressed against the wall rather than peeling away from it, which is why wind tunnels and carburettors use a converging inlet and never a square step. Past the throat the section is released gently, so the column expands into the duct instead of slamming into it. Two things follow: more of the duct bore carries moving air, and the sound stays closer to fan tone than to the wide-spectrum rush of a shear layer tumbling over a sharp edge.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar with venturi throat |
| Mount style | Venturi profile — contracting throat, plain barrel collar |
| Footprint | 250 × 165 × 152.4 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, modify and redistribute |
| Download | STL, licence and installation guide (ZIP) — listed on the model card |
| SKU | DC-SHR-VEN-D120-6 |
The curve through this throat is D-Central’s own drawing, and it goes out free like the rest of the line: open source under CC BY-SA 4.0 at the 3D models download center, yours to download, modify, print and sell. Shapes that move air well should not be trade secrets.
D-Central Technologies drew that curve, on our own bench, for our own machines. The card for this model and the ZIP file carry the STL, the CC BY-SA 4.0 licence and the installation and safety guide.
This page sells the finished part, made to order in black or orange PETG and shipped from Montreal, Quebec, for people who would rather duct a miner than model one. Every order, and every contribution through D-Central’s fund page, pays for the next shape we draw.
Every mount style and duct size in the family sits in the D-Central shroud and ducting system.
It replaces the sharp shoulder between plenum and collar with a smooth contraction. Air accelerating into a narrowing section stays pressed to the wall; air arriving at a square step lets go and rolls into a vortex that occupies part of the duct. The throat is there so the whole bore carries moving air.
No. The collar is a full 6-inch duct connection, the same as every other 6-inch shroud in the line, and the section opens back out past the narrowest point. A venturi is a shape, not a smaller pipe: the contraction keeps the flow attached, and the re-expansion hands the column back at full size.
Take the venturi when the run downstream is long, bent, shared or fed through an inline fan, because that is where transition losses compound. Take the plain dual-120 shroud when the duct goes straight out of the nearest wall. Same machines, same fan screws, same 6-inch duct either way.
Venturi for the flow path. Offset when the duct cannot leave straight back. Clamp-groove for a band clamp that cannot walk off. Bayonet for tool-free removal. Threaded for a screw-on stack. All five take the same fans and the same duct.
Neither. The S21 Pro and S21 XP carry 140 mm fans on a wider face and take the S21 Pro dual 140 mm shroud. The S9 has a single 120 mm fan and takes the Antminer S9 single 120 mm shroud. This body is drawn for the two-fan 120 mm face.
| Weight | 354 g |
|---|---|
| Dimensions | 25 × 15.24 × 16.5 cm |
| Colour | Black, Orange |
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