$41.99 CAD
200 mm duct shroud for Antminer S19 and S21 dual 120 mm exhaust, sized for 200 mm inline duct fans and Avalon Q ducting. True metric collar, not 8-inch. Single-piece PETG, made to order in Montreal, Quebec.
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200 mm is the top of the metric ducting ladder, and it is where you go when you have stopped thinking about one machine and started thinking about a run. It is the size the larger metric inline duct fans are built in, the size HI-200EC class fans mate with, and the size Avalon Q ducting uses. It is also not 8 inches: 8 inches is 203.2 mm, so an imperial collar and a 200 mm hose are two different parts that only look compatible in a photograph.
This shroud merges both fan columns of an S19-class or standard S21-class exhaust inside one PETG body and opens them into a 200 mm metric collar: 200.0 mm crest, 198.0 mm sealing land.
Any miner with two touching 120 mm exhaust fans on a 120.0 mm pitch, 116.0 mm bore per fan with a 2.0 mm sealing land per side. The Antminer S19 series, including S19j Pro and S19 XP, and the standard S21. The outlet takes 200 mm metric duct, including 200 mm class inline fan runs and Avalon Q ducting.
For imperial fittings, use the dual 120 mm to 8-inch duct shroud at 203.2 mm instead. For a 140 mm fan machine on the same 200 mm duct, take the dual 140 mm to 200 mm metric shroud. For a smaller metric run, the 160 mm version is the next step down.
Duct diameter buys two things: less friction per metre, and lower velocity for the same volume of air. Lower velocity is the quiet one, because air noise in a duct rises steeply with speed. That is why a long run or a shared plenum belongs at 200 mm even when the machine feeding it has modest fans.
The transition inside the body still does the real work. Two 120 mm fan columns are merged before the round transition starts, then the section opens gradually rather than stepping, so the flow stays attached to the wall instead of separating in the corner of an abrupt expansion.
| Fits | Any miner with two touching 120 mm exhaust fans at 120.0 mm pitch (Antminer S19 series, standard S21, similar) |
|---|---|
| Intake | Two 120 mm fans at 120.0 mm pitch; 116.0 mm bore per fan, 2.0 mm sealing land per side |
| Outlet | 200 mm metric duct, flex-over collar; crest 200.0 mm, sealing land 198.0 mm |
| Footprint (mm) | 260.0 × 200.0 × 165.0 |
| Mounting | 5.0 mm holes on 5.424 mm slots; 9 mm or larger washer |
| Material | PETG |
| Colour | Black or orange PETG |
| Construction | Single piece, no seams or glued joints |
| Design files | D-Central in-house design, open source under CC BY-SA 4.0 |
| Download | 200 mm metric shroud bundle (ZIP) — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | ADP-D120-200 |
| Fulfilment | Made to order in Montreal, Quebec |
D-Central Technologies drew this shroud, measured it and released it under CC BY-SA 4.0 at the 3D models download center, with its own card at the dual 120 mm to 200 mm entry. Download it, modify it, print it, sell prints of it. The file is the 200 mm metric shroud bundle — STL, CC BY-SA 4.0 licence, installation and safety guide. A 200 mm collar is a big part to ship across an ocean, and if you have a printer near you it makes more sense for the file to travel than the plastic. When you would rather it arrive finished, this listing is the made part: PETG in black or orange, produced to order in Montreal, Quebec, shipped from Canada. The geometry is free permanently; ordering one, or giving through the D-Central fund page, is what funds the drawings that come after it.
The rest of the chain is in the D-Central shroud and ducting system.
3.2 mm. Eight inches is 203.2 mm and this collar is 200.0 mm, drawn for metric hose. Put a 200 mm hose on an 8-inch collar and it will not go over the crest cleanly; put 8-inch hose on this one and the clamp has slack to take up. Match the collar to the duct you own, or buy the 8-inch version.
Not in a way that costs you anything. A larger duct lowers air velocity for the same volume, which means less friction per metre and less air noise. The reasons to go smaller are practical rather than aerodynamic: 200 mm hose costs more, takes more room behind the machine and needs bigger fittings all the way to the wall.
So the clamp always has somewhere to go. The land sits 2.0 mm under nominal, at the tight end of the range of male hardware a 200 mm duct is built to slide over, which means the clamp closes onto the duct wall rather than bottoming out on the collar. The 200.0 mm crest above it is the mechanical stop that keeps the duct on.
The duct side does: Avalon Q ducting is 200 mm, so downstream of this collar everything is shared. The mounting side does not, because this flange is cut for a dual 120 mm Antminer-pattern fan face. For a Canaan Avalon exhaust, use the Canaan Avalon A15 200 mm shroud.
| Weight | 403 g |
|---|---|
| Dimensions | 26 × 20 × 16.5 cm |
| Colour | Black, Orange |
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