Bitcoin accepted at checkout | Ships from Montreal, QC, Canada | Expert support since 2016
$57.99 CAD
Two 120 mm fans, one merging plenum, one reactive expansion chamber, one 6-inch duct. This is the part for the S19 or standard S21 that lives somewhere it can be heard — a basement below a bedroom, a garage attached to a house, a shop with neighbours.
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Two 120 mm fans, one merging plenum, one reactive expansion chamber, one 6-inch duct. This is the part for the S19 or standard S21 that lives somewhere it can be heard — a basement below a bedroom, a garage attached to a house, a shop with neighbours.
Designed around the rear 120 mm fan pair on the Antminer S19 series and the standard Antminer S21. Not for the S21 Pro (140 mm pair) or the S21 XP. Standard 6-inch output collar.
Measure before you order. Fit dimensions in this line are derived from published fan and chassis geometry and are not yet validated against measured production hardware. Check your flange size and the clearance around your machine against the footprint in the specifications below. If something does not fit, tell us — that is how the next revision gets better.
Fits over the fan pair like a plain dual-120 shroud, but with the chamber volume between the fans and the collar. It is a substantially larger body than the plain version — measure the clearance behind the machine before you commit, particularly in a rack.
Dual-fan Antminers put out a broadband roar with a strong tonal component from the blade-pass frequency. A reactive chamber attacks that by geometry rather than by absorption, so there is no foam to clog with dust or shed into the airflow. The honest scale: an idealised chamber of these dimensions predicts single-digit decibels of transmission loss, and this one has not been measured. If you need a bigger number than that, you need mass and distance, not plastic.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar |
| Footprint | 250 × 198 × 157 mm |
| Material | PETG |
| Construction | Single continuous body — no assembly, no fasteners, no glued joints |
| Design files | Open source — free to download, use, modify and redistribute |
| SKU | DC-SIL-D120-6 |
Every shroud D-Central designs is released as an open file. The geometry for this part is free to download from our 3D models download center: use it, modify it, remix it, run it in your own shop, sell what you make from it. There is no licence to buy and no design gated behind a purchase. Shared knowledge is the whole reason this industry has open hardware at all, and we are not going to be the ones who stop passing it on.
This listing is for the finished part: made to order in PETG and shipped from Montreal, Quebec. If you would rather have it in your hands than spend an evening making one, buy it here — that is what pays for the next design in the line. You can also support the open-source work directly through D-Central’s fund page.
See the full D-Central shroud and ducting system for the compatibility matrix and sizing guide.
The v2 adds a quarter-wavelength side branch tuned to a specific frequency on top of the same expansion chamber, and it is a drop-in replacement dimensionally. On paper the v2 should notch harder around its tuned frequency. Neither has been measured, so the v2 is priced as a premium option, not sold as a proven upgrade.
Probably not on the strength of this part alone. Noise complaints are usually about low-frequency energy travelling through structure, and a printed chamber in the air path does not address structure-borne transmission. Combine it with isolation, distance and placement.
It is significantly deeper than the plain dual-120 shroud. Measure your rack depth behind the machine before ordering — the listed footprint is the real envelope of the part.
| Weight | 400 g |
|---|---|
| Dimensions | 25 × 19.8 × 15.7 cm |
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