$73.99 CAD
The full-build Antminer S19 / S21 silencer: merged plenum, reactive expansion chamber, quarter-wave side branch cut to a nominal 750 Hz design target in the blade-pass region, and a full 8-inch collar for long ducted runs. One PETG piece, no lining. Made to order in Montreal, Quebec.
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Use the S21 cluster to connect current-generation specs, buying options, chip-level parts, troubleshooting, and repair support.
This is the tuned silencer shroud for a full ducted build: both rear 120 mm fans merged into one plenum, a reactive expansion chamber, a quarter-wave side branch cut for the blade-pass region, and a full 8-inch collar on the end. It is the most work any single body in this line does, and the 8-inch outlet is what makes that work affordable in airflow terms.
The people who fit this part are not taking the edge off a machine in a garage. They are running exhaust across a house, up through a joist bay, into a booster fan and out a wall, and they want the acoustic treatment to happen at the machine rather than everywhere along the way. On a short simple run, the 6-inch v2 does the same acoustics in a smaller envelope.
Rear 120 mm fan pair on the Antminer S19 series and the standard Antminer S21, seating on the stock fan screws. Not the S21 Pro or S21 XP, which use 140 mm fans and take the S21 Pro dual 140 mm to 8" shroud. The collar is a standard 8-inch outside diameter for insulated flex, rigid pipe and 8-inch inline fans.
This is the largest body in the range at 250 × 244.2 × 228.2 mm, so confirm the depth, width and height free behind the machine. The standing advice holds: a silencer trades part of the airflow budget for quiet, so a machine already at the edge of its thermal range is better served by the plain dual 120 mm to 8" duct shroud with distance doing the noise work.
Both acoustic elements are inside the body, so there is nothing to assemble, adjust or service afterwards. No wiring, no fan swap, stock fan control untouched.
The chamber and the branch do different jobs. The reactive expansion chamber is broad: a sudden change in cross-sectional area reflects part of any wave travelling down the duct back toward the source, so it works across the general rush of a dual-fan Antminer. The quarter-wave side branch is narrow and deep: a closed stub cut to a quarter of a target wavelength, so sound entering it returns half a wavelength later and cancels around that frequency. This stub is cut to a quarter of the wavelength at a nominal 750 Hz design target — the blade-pass region for a 120 mm fan pair of this class, the part of miner noise that gets into rooms the machine is not in. Branch walls are held at 2.15 mm minimum, because a resonator that leaks is a pocket rather than a resonator.
Running both elements takes volume, and volume in an exhaust path has to be paid for. The full 8-inch collar is where it gets paid: roughly 1.8 times the open area of a 6-inch collar, the headroom a long, bendy, boosted run needs once a chamber is in the path. Nothing inside is lined — foam and fibre work, and they also compress, embrittle and shed into air about to cross your hashboards.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 8″ duct collar |
| Acoustic elements | Reactive expansion chamber plus a tuned λ/4 side branch |
| Footprint | 250 × 244.2 × 228.2 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_v2.zip — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | DC-SIL-D120-8-V2 |
The flagship of the line is published on the same terms as the cheapest part in it. This body’s geometry is released open source under CC BY-SA 4.0 at the 3D models download center: download it, retune the stub, resize the chamber, print it for your own hashcenter or print it for customers. A duct fitting is not a secret worth keeping.
D-Central Technologies designed this body — the merged plenum, the chamber, the tuned stub and the 8-inch throat — and open-sourced all of it. Ours, given away. The card is at the 8-inch v2 silencer entry; the file is silencer_dual_120_to_8in_v2.zip, with the STL, the CC BY-SA 4.0 licence and the installation and safety guide.
Buying it here gets the finished object without tying up a printer for the hours a body this size takes: made to order in PETG, black or orange, shipped from Montreal, Quebec, cut to the same collar tolerance as every coupler and elbow in the system. Files stay free; buying the part or backing D-Central’s fund page pays for the next one.
Plan the whole route with the D-Central shroud and ducting system, which carries every collar size and fitting in one tolerance standard.
Because it is the only body doing all four jobs at once: merge two fan columns, run a reactive chamber, run a tuned quarter-wave branch, and still open into a full 8-inch throat. On a short straight run you are paying for collar area you will not use — the 6-inch v2 is the same acoustics in a smaller package.
Compare 250 × 244.2 × 228.2 mm against your real clearance, height included. This is the biggest body we make and it will not fit every rack. If it does not, the v1 8-inch silencer is shorter, and the plain 8-inch shroud is shorter again.
That is the install it was drawn for. Put the inline fan downstream on the 8-inch run, joined with the 8" duct coupler, and keep the duct straight either side of it. The booster pulls the run so the miner’s own fans are not shouldering the whole route, and the silencer works right at the source.
Yes, and the file is free at the 3D models download center like everything else in this line. A body this size occupies a printer for a long stretch, which is why most people buy the finished one. Either way the design is yours to modify, and anything you build from it is yours to sell.
The blade-pass tone — the rate at which fan blades sweep past a fixed point, the whine sitting on top of the broadband rush. The chamber handles the broad part; the branch is aimed at the tone that carries through floors and walls.
| Weight | 614 g |
|---|---|
| Dimensions | 25 × 24.42 × 22.82 cm |
| Colour | Black, Orange |
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