Bitcoin accepted at checkout | Ships from Montreal, QC, Canada | Expert support since 2016
$41.99 CAD
The airflow-first member of the dual-120 family. Instead of stepping the plenum straight down to the collar, the venturi profile contracts and then re-expands through the throat, giving the merged air stream a smooth path rather than a hard shoulder to separate off.
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The airflow-first member of the dual-120 family. Instead of stepping the plenum straight down to the collar, the venturi profile contracts and then re-expands through the throat, giving the merged air stream a smooth path rather than a hard shoulder to separate off.
Same intake as the rest of the dual-120 family: the rear 120 mm fan pair on the Antminer S19 series and the standard S21. Not for the S21 Pro or XP. Output is a standard 6-inch duct collar.
Measure before you order. Fit dimensions in this line are derived from published fan and chassis geometry and are not yet validated against measured production hardware. Check your flange size and the clearance around your machine against the footprint in the specifications below. If something does not fit, tell us — that is how the next revision gets better.
Use it exactly like the plain dual-120 shroud — over the fan pair, clamp a 6-inch duct to the collar. Choose it over the plain version when the duct run downstream is already working hard and you would rather not add avoidable turbulence at the transition.
A hard step from a wide plenum to a narrow collar makes the flow separate off the shoulder, and separated flow is both lossy and noisy. A contracting throat keeps the stream attached through the transition. We have not measured the difference on a bench, so we are not going to quote you a number — but the geometry is the one fluid dynamics would pick.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar (venturi throat) |
| Footprint | 250 × 157 × 165 mm |
| Material | PETG |
| Construction | Single continuous body — no assembly, no fasteners, no glued joints |
| Design files | Open source — free to download, use, modify and redistribute |
| SKU | DC-SHR-VEN-D120-6 |
Every shroud D-Central designs is released as an open file. The geometry for this part is free to download from our 3D models download center: use it, modify it, remix it, run it in your own shop, sell what you make from it. There is no licence to buy and no design gated behind a purchase. Shared knowledge is the whole reason this industry has open hardware at all, and we are not going to be the ones who stop passing it on.
This listing is for the finished part: made to order in PETG and shipped from Montreal, Quebec. If you would rather have it in your hands than spend an evening making one, buy it here — that is what pays for the next design in the line. You can also support the open-source work directly through D-Central’s fund page.
See the full D-Central shroud and ducting system for the compatibility matrix and sizing guide.
Untested on a bench, so we will not claim a number. What we can say is that a smooth contraction is the shape that keeps flow attached through a transition, and a hard step is the shape that makes it separate. If you want the geometry that theory prefers, this is it. If you want the cheapest working part, take the plain dual-120.
Venturi for airflow, offset when the duct cannot leave straight back, clamp-groove for a positive band-clamp seat, bayonet for tool-free removal, threaded for a screw-on collar. They all move the same air from the same fans.
No — that machine uses a 140 mm fan pair. See the S21 Pro shroud.
| Weight | 265 g |
|---|---|
| Dimensions | 25 × 15.7 × 16.5 cm |
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