$65.99 CAD
Antminer S19 / S21 silencer shroud with a full 8-inch collar, for long duct runs, elbows and inline boosters. Reactive expansion chamber over both rear 120 mm fans, roughly 1.8x the open area of a 6-inch outlet. Made to order in PETG in Montreal, Quebec.
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The dual 120 mm to 8-inch silencer shroud is the version built for a real duct run. Same reactive expansion chamber over the S19 or standard S21 fan pair, same merged plenum feeding it, but terminated in a full 8-inch collar. An 8-inch outlet carries roughly 1.8 times the open area of a 6-inch one, and that extra area is what lets an acoustic body sit in an exhaust path that also holds twenty feet of duct, a couple of elbows and possibly an inline fan.
Treat the exhaust path as a single budget. The chamber, each bend, each foot of flex and the window port at the end all spend part of it. This is the part to choose when the budget is already committed elsewhere and you still want the acoustics.
The rear 120 mm fan pair on the Antminer S19 series and the standard Antminer S21, mounted on the fans’ own screw positions. Not the S21 Pro or S21 XP — those run 140 mm fans and take the S21 Pro dual 140 mm to 8" shroud. The outlet is a standard 8-inch collar that mates with insulated flex, rigid pipe and 8-inch inline fans such as an AC Infinity Cloudline S8 or T8.
Two sizing notes, the kind you would get across a counter. This body is larger than a plain shroud at 250 × 203.2 × 198.2 mm, so confirm the clear depth behind the machine. And if the machine already runs at the top of its thermal range, the right part is the plain dual 120 mm to 8" duct shroud, with distance doing the noise work. A silencer trades a slice of airflow for quiet, and that is a good trade right up until it is not.
No wiring, no fan swap, no controller change. The stock fans keep running their own curve, and the shroud lifts away when you need to open the machine.
A reactive expansion chamber quiets a duct by geometry: a sound wave in a pipe partially reflects wherever the cross-section changes suddenly, so widening the passage, holding that volume and necking it back down turns part of the fan’s energy back toward the machine instead of shipping it down the duct. That mechanism does not care whether the collar is 6-inch or 8-inch. The collar decides how much airflow the chamber costs on the way.
Which is why the 8-inch version is its own part rather than an adapter bolted to the 6-inch one. A reducer sitting straight on a chamber outlet stacks two restrictions at the worst possible place, right where the flow is still reorganising. Drawing the chamber to open into a full 8-inch throat keeps that transition gradual and leaves the pressure budget for the duct to spend. If you need to join a 6-inch section later, the 8" to 6" duct reducer does it downstream where it costs less.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 8″ duct collar |
| Footprint | 250 × 203.2 × 198.2 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 | silencer_dual_120_to_8in.zip — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | DC-SIL-D120-8 |
D-Central engineers this line in-house and publishes it rather than protecting it. The 8-inch silencer geometry is open source under CC BY-SA 4.0 at the 3D models download center, free to download, alter, remix, print and sell. If you would rather lengthen the chamber or cut a different collar, the drawing is yours to change.
D-Central Technologies drew this chamber and its 8-inch throat and open-sourced the file. Our design, published under CC BY-SA 4.0 rather than kept. Model card: the dual 120 mm to 8-inch silencer entry. Direct file: silencer_dual_120_to_8in.zip, with the STL, the licence and the installation and safety guide inside it.
What this page sells is the finished body: made to order in PETG, shipped out of Montreal, Quebec, printed to the same tolerance standard as every other collar in the system so the parts actually stack. Black and orange are the two colours it is offered in. The files cost nothing; buying the printed part or backing D-Central’s fund page is what funds the next design.
Every collar, coupler and gate that follows this part is catalogued in the D-Central shroud and ducting system.
Duct length and bends. A short straight run to a window is happy on the 6-inch silencer, which is smaller and easier to fit. Once the route gets long, turns corners, joins a trunk or passes through a booster fan, the pressure budget tightens and the 8-inch collar keeps the acoustic body from being the element that breaks it.
Yes. The collar is a standard 8-inch outside diameter, the size those inline fans and their duct are built to. Join them with the 8" duct coupler and clamp both sides. Running the inline fan downstream means the duct is pulled through rather than pushed through, which is the easier job for the miner’s own fans.
You can, and downstream is the right place. Use the 8" to 6" reducer a little way along the run rather than hanging it on the chamber outlet where the flow is still reorganising. If your whole run is 6-inch anyway, the 6-inch silencer is the cleaner and cheaper answer.
Yes. The v2 keeps this chamber and adds a quarter-wave side branch aimed at the tonal blade-pass region, all in one printed piece. Choose this one for the broad chamber treatment in the smaller envelope; choose the v2 when the fan whine specifically is the sound that carries.
The envelope is 250 × 203.2 × 198.2 mm, measured off the mesh rather than rounded to a nominal size. Include anything mounted above the miner, and leave the duct a gentle radius coming off the collar. Where space is genuinely tight, the plain 8-inch shroud is the compact install.
| Weight | 517 g |
|---|---|
| Dimensions | 25 × 20.32 × 19.82 cm |
| Colour | Black, Orange |
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