$35.99 CAD
Offset duct shroud for the Antminer S19 and standard S21: the 6-inch collar sits off centre so the duct clears shelves, walls and rack uprights, often saving an elbow. One-piece PETG, made to order in Montreal, Quebec.
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This offset duct shroud moves the 6-inch collar away from the centre of the Antminer S19 and S21 exhaust face, so the duct leaves from wherever the room actually has space. A shelf above the machine, a wall an inch behind it, a rack upright in the way, a window that is not where you would have put it: the exit is decided by the building, not by the miner.
The usual fix is to bolt an elbow onto a centred collar and turn the line where it needs to go. That works, and it costs you a fitting, the space it occupies, and the pressure every 90-degree turn takes out of the run. Shifting the collar removes that fitting from the path.
Intake is the rear 120 mm fan pair on the Antminer S19, S19 Pro, S19j, S19j Pro, S19k Pro, S19 XP and the standard S21, on stock fan screws. Outlet is a standard 6-inch collar sitting off centre on the same 250 x 165 x 152.4 mm body, so the shroud takes no more space than the centred version; the duct simply leaves from a different point on it.
If nothing is crowding the back of your machine, buy the plain Antminer S19 / S21 Dual 120 mm to 6" Duct Shroud: a centred collar is the simpler flow path, and there is no reason to pay for geometry you will not use. The S21 Pro, S21+ and S21 XP run a 140 mm fan pair and take the Antminer S21 Pro Dual 140 mm to 6" Duct Shroud. For the same offset on a broader base, see the Antminer S19 / S21 Dual 120 mm to 6-Inch Offset Shroud — Wide Base.
The neatest duct run is the one with the fewest fittings in it. Every 90-degree elbow forces the whole column to turn inside a short length of pipe, and the tighter the turn, the more of the flow separates on the inside of the bend. Published duct-fitting loss data has said it for decades: bends are expensive, short bends twice over. An offset collar does not turn the flow, it moves where the flow leaves. The plenum is asymmetric as a result, which is not free, but it is a far smaller cost than an elbow bolted to the exhaust face.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar, offset from centre |
| Mount style | Offset collar — orientation sets the offset direction |
| 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-OFF-D120-6 |
D-Central draws these parts and publishes them. The offset body is released open source under CC BY-SA 4.0 at the 3D models download center, free to download, modify, print and sell. That matters more here than on most parts: if none of the four orientations lands where your building needs the duct, the file is yours to move the collar anywhere on the face.
The offset body is D-Central Technologies’ own drawing, start to finish. Its card in the download centre links the ZIP, which carries the STL, the CC BY-SA 4.0 licence and the installation and safety guide.
Buying the finished part is the faster route. It is made to order in PETG, in black or orange, and shipped from Montreal, Quebec. The drawings stay free; the orders, and D-Central’s fund page, are what keep them coming.
The rest of the fittings, in matching 6-inch and 8-inch sizes, are in the D-Central shroud and ducting system.
Whichever way you point it. The offset is built into the body and the direction is set by how you rotate the shroud on the exhaust face: up toward a high window, down toward a floor penetration, or to either side to clear a rack upright or a neighbouring machine. One part covers all four.
The plenum is asymmetric, which in isolation is not the ideal transition. Set that against what it usually replaces: a 90-degree elbow bolted to the exhaust face, turning the entire column inside a short bend. In a constrained install the offset is the cheaper geometry; where space allows, the centred shroud is the better path.
Often not. If the offset alone lines the collar up with your wall sleeve or window port, the duct runs straight from shroud to exit with no fitting between. Where the run still has to turn, a 6" 45-degree elbow after the offset is gentler than a 90-degree bend at a centred collar.
The body needs the same 250 x 165 x 152.4 mm behind the fan face as the centred version. What the offset buys is the duct itself: instead of a duct plus a bend projecting from the middle, the line can start hard against the side the room has space on. Plan for the duct bend radius too.
Offset when geometry is the constraint and the duct cannot leave straight back. Venturi when the run is long and airflow is the constraint. Clamp-groove, bayonet and threaded when how the duct attaches and detaches matters more than where it leaves. All five share this intake, this footprint and the same stock fan screws.
| Weight | 368 g |
|---|---|
| Dimensions | 25 × 15.24 × 16.5 cm |
| Colour | Black, Orange |
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