$35.99 CAD
Antminer S19 / S21 dual 120 mm to 6-inch duct shroud: both rear exhaust fans merged into one 6-inch collar, with driver access to all eight fan screws. One-piece PETG, made to order in Montreal, Quebec, open-source design.
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This Antminer S19 / S21 dual 120 mm to 6-inch duct shroud merges both rear exhaust fans into one 6-inch collar, so the heat leaves down a duct instead of pooling behind the machine. Bitmain gives you two fans behind an open grille and nothing round to clamp to, and everything downstream depends on that first connection.
Six inches is the size most single-machine installs want: it passes a standard wall sleeve, it is the flexible duct stocked in every hardware store, and it is what the common inline fans are built around. Drawn in-house around the S19 and S21 exhaust face and printed in PETG, which holds its shape in an exhaust stream that leaves a PLA part drooping off the fan face.
Built around the rear 120 mm fan pair on the Antminer S19, S19 Pro, S19j, S19j Pro, S19k Pro and S19 XP, plus the standard Antminer S21. The body is relieved around the fan screws, so a driver reaches all eight heads with the shroud in place and a fan swap does not start by dismantling the exhaust.
It is not the part for the S21 Pro, S21+ or S21 XP, which all carry a 140 mm fan pair, nor for the liquid-cooled S21 Hydro, which has no fan face at all. The 140 mm machines take the Antminer S21 Pro Dual 140 mm to 6" Duct Shroud. Single-fan machines such as the S9 take the Antminer S9 Single 120 mm to 6" Duct Shroud. For a long or bendy run, size up to the Antminer S19 / S21 Dual 120 mm to 8" Duct Shroud; for the same airflow body on a broader base, see the Antminer S19 / S21 Dual 120 mm to 6-Inch Shroud — Wide Base.
Two fans blowing into one duct is an awkward fluid problem, and the improvised answer, a flat plate with a round hole in it, makes it worse: both columns hit a hard step at once, collide, and separate off the shoulder of the hole. Separated flow is lossy, and the turbulence is what you hear as roar rather than fan tone. This body gives the two streams a shaped plenum to merge in first, so they arrive at the collar as one column.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair. Not the S21 Pro, S21+ or S21 XP (140 mm pair), and not the S21 Hydro. |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar, flexible or rigid duct |
| Footprint | 250 × 165 × 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, modify and redistribute |
| Download | STL, licence and installation guide (ZIP) — listed on the model card |
| SKU | DC-SHR-D120-6 |
D-Central designs these parts and gives the designs away. This line goes out open source under CC BY-SA 4.0 at the 3D models download center: free to download, modify, print, sell and build on. No licence to buy, no file locked behind an order.
D-Central Technologies designed this shroud in-house: our measurement of the exhaust face, our plenum, our collar, published rather than protected. It is not a remix of anyone else’s file. Take it from this model’s card in the download centre, or straight from the ZIP, which holds the STL, the CC BY-SA 4.0 licence and the installation and safety guide.
This listing is the finished part, made to order in PETG — black or orange — and shipped from Montreal, Quebec. The files stay free either way: buying the printed part, or backing D-Central’s fund page directly, is what pays for the next design in the line.
The whole chain, shroud to coupler to elbow to window port, is in the D-Central shroud and ducting system.
The rear 120 mm fan pair on the S19, S19 Pro, S19j, S19j Pro, S19k Pro and S19 XP, plus the standard S21. Machines with a 140 mm pair need a different part: the S21 Pro takes the S21 Pro shroud, Whatsminer hardware the Whatsminer 140 mm shroud, and single-fan machines the universal 120 mm shroud.
No. The stock screws stay put and nothing is sandwiched between fan and chassis. The body is cut back around the screw heads so a driver reaches all eight with the duct still attached, which is the difference between a fan swap taking five minutes and taking an afternoon.
Six inches carries a single S19 or S21 on a short, direct run: through a wall, out a nearby window, into the next room. Move up to the 8-inch shroud when the duct climbs, turns twice or joins a shared trunk. Oversizing costs space; undersizing costs airflow you already paid for.
Nothing on the miner changes: no holes, no soldering, no wiring, no firmware, stock fans and screws retained, and the shroud lifts off in one movement. A duct shroud is a mechanical part outside the chassis. If you run under a service agreement, read its terms; the machine itself is untouched.
Every part in this line is made to order in Montreal, Quebec and shipped worldwide. Building to order is why the geometry keeps improving instead of freezing at whatever sits in a warehouse. For a quieter install, the expansion-chamber shroud silencer puts a volume between the fans and the duct.
| Weight | 346 g |
|---|---|
| Dimensions | 25 × 15.24 × 16.5 cm |
| Colour | Black, Orange |
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