$57.99 CAD
Antminer S19 / S21 silencer shroud: both rear 120 mm fans merged into one plenum, stepped into a reactive expansion chamber, out through a 6-inch collar. The flattest body in the silencer range. Made to order in PETG, shipped from Montreal, Quebec.
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This Antminer S19 silencer shroud gathers both rear 120 mm fans into one plenum, steps that merged flow out into a reactive expansion chamber, and hands it to a 6-inch duct. The middle element is what you are paying for: a deliberate change in cross-section that sends part of the fan noise back toward the machine instead of letting it ride the air column down the duct and out the far end.
It is the part for an S19 or standard S21 that lives somewhere it can be heard — a basement under a bedroom, a garage sharing a wall with the house, a shop with neighbours. At 152.4 mm across its shallow axis it is also the flattest body in the silencer range, which makes it the one that still fits where the big ones do not.
Drawn around the rear 120 mm fan pair on the Antminer S19 series and the standard Antminer S21, seating on the fans’ own screw positions. Not the S21 Pro or S21 XP, which run 140 mm fans on a different face — those take the S21 Pro dual 140 mm shroud. Output is a standard 6-inch collar.
Pick the 6-inch chamber when the duct run is short and reasonably straight. A silencer is a larger part than a funnel, and a chamber spends part of the same pressure budget your ducting spends, so on a long bendy route the 8-inch version is the smarter buy, and on a thermally tight machine the plain dual 120 mm to 6" duct shroud is better still. That is buying advice from a shop that works on these machines.
Nothing electrical is touched and no fan is replaced, so the machine keeps its factory fan control. Two screws per fan and it comes back off again.
Two 120 mm fans blowing into two separate throats produce two turbulent columns that then argue with each other in the duct. Merging them into a shared plenum lets the flow settle and gives the acoustics one well-defined passage to work on. Only then does the cross-section step out into the chamber.
The chamber is reactive silencing: no absorption, no consumable, just geometry. A sound wave in a pipe partially reflects every time the pipe’s area changes abruptly, so a sudden widening, a held volume and a return to the collar sends a share of the energy back where it came from. Dual-fan Antminers put out a broad roar with a tone riding on it, and the chamber is the broad answer. If the whine specifically is what bothers you, the v2 with the quarter-wave side branch adds an element aimed at exactly that.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar |
| Footprint | 250 × 211.2 × 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, use, modify and redistribute |
| Download | silencer_dual_120_to_6in.zip — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | DC-SIL-D120-6 |
Every part in this line is drawn in-house at D-Central and then given away. The dual 120 mm silencer geometry is published open source under CC BY-SA 4.0 at our 3D models download center — download it, change the collar, widen the chamber, print it for your own rack or print it for money. We do not gate designs behind a purchase.
D-Central Technologies designed this body, merged the two fan columns into one plenum on paper before anything was printed, and open-sourced the result. It is our geometry. The card is at the dual 120 mm silencer entry and the file is silencer_dual_120_to_6in.zip: the STL, the CC BY-SA 4.0 licence and the installation and safety guide.
The listing you are on is the finished article: made to order in PETG and shipped from Montreal, Quebec, in black or in D-Central orange. The file stays free; buying the printed part or backing D-Central’s fund page is what pays for the next design in the line.
Collar sizes, mount styles and the full compatibility matrix are laid out in the D-Central shroud and ducting system.
Yes to all three, along with the rest of the S19 series, because they share the same rear 120 mm fan pair and screw positions. The exceptions are the S21 Pro and S21 XP, which moved to 140 mm fans and take the S21 Pro dual 140 mm to 6" shroud. When in doubt, go by the fan size on the back, not the badge on the front.
Short straight run to a window or an outside wall: 6-inch is plenty and the smaller body is easier to live with. Long route, multiple elbows, an inline booster or a shared trunk: take the 8-inch silencer, because the chamber and the ducting draw on one pressure budget and the wider collar gives it room.
This is the expansion chamber alone: broad treatment across the fan’s noise. The v2 keeps that chamber and adds a quarter-wave side branch tuned to the blade-pass region, which is the tonal whine specifically. Buy this one for the compact body and the broad approach; buy the v2 if the whine is what carries through your floor.
Yes. The body seats on the fan pair’s existing screw positions, so the machine goes back to standard in a couple of minutes. Nothing is cut, no connector is unplugged and no fan is swapped — the shroud is a purely mechanical part sitting outside anything electrical.
It is the shallowest silencer we make at 152.4 mm on that axis, but the envelope is 250 × 211.2 × 152.4 mm, deeper than the plain dual 120 mm shroud. Compare that against the clear space behind your machine. Where the rack is tight, the plain shroud with a longer duct run is the install that goes in cleanly.
| Weight | 473 g |
|---|---|
| Dimensions | 25 × 15.24 × 21.12 cm |
| Colour | Black, Orange |
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