Bitcoin accepted at checkout | Ships from Montreal, QC, Canada | Expert support since 2016
$10.99 CAD
A screw-on blanking cap for the threaded-collar shroud. Seals an idle machine’s exhaust in a couple of seconds, and comes off just as fast when the machine goes back into service.
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A screw-on blanking cap for the threaded-collar shroud. Seals an idle machine’s exhaust in a couple of seconds, and comes off just as fast when the machine goes back into service.
Matches the coarse thread on the Antminer S19 / S21 threaded-collar shroud. It is a companion part to that specific collar, not a universal duct cap.
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.
Screw it on when a machine comes out of service. In a row of machines sharing a duct trunk, cap the idle ones so the running machines are not pushing air backwards through them — and so the building is not drawing outside air in through an open duct all winter.
An uncapped exhaust on an idle machine is a hole in your building. In a shared-trunk install it is worse than that: it is a low-resistance path that steals flow from the machines that are actually running. Capping idle units is one of those small operational habits that quietly makes a whole install behave better.
| Fits | The threaded collar on the Antminer S19 / S21 threaded-collar shroud |
|---|---|
| Intake | Threaded 6″ collar |
| Outlet | Sealed |
| Footprint | 166 × 166 × 42 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-ACC-CAP-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.
No. It is cut to the thread on the threaded-collar shroud. The plain, venturi, offset, clamp-groove and bayonet collars all terminate differently.
You can, and people do. The cap seals properly, does not fall off, does not get sucked into a fan, and takes two seconds. It costs about as much as a decent lunch.
No. Never block the exhaust of a machine that is powered on — the heat has nowhere to go and the fans are working against a dead end.
| Weight | 45 g |
|---|---|
| Dimensions | 16.6 × 16.6 × 4.2 cm |
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Last reviewed July 31, 2026.
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