Bitcoin accepted at checkout | Ships from Montreal, QC, Canada | Expert support since 2016
$43.99 CAD
A shroud with an acoustic job on top of the ducting job. Instead of taking the fan straight to a collar, the air passes through a reactive expansion chamber — a deliberate volume change that reflects part of the sound energy back toward the source rather than letting it travel down the duct with …
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A shroud with an acoustic job on top of the ducting job. Instead of taking the fan straight to a collar, the air passes through a reactive expansion chamber — a deliberate volume change that reflects part of the sound energy back toward the source rather than letting it travel down the duct with the air.
Standard 120 × 120 mm fan face on the intake, which covers the Antminer S9 family and effectively any single-fan build. Output is a standard 6-inch duct collar, so it drops into an existing 6-inch run in place of a plain shroud.
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.
It installs exactly like the plain single-120 shroud — over the fan, duct clamped to the collar — but it stands taller and deeper, so check your clearance behind the machine before ordering. Everything downstream stays the same.
Reactive silencing works on geometry rather than absorption: sound hitting a sudden area change partially reflects instead of passing through. It costs you nothing in consumables and there is no foam to degrade or shed into your duct. Be realistic about the scale of the effect — an idealised expansion chamber of this size predicts only single-digit decibels of transmission loss, and we have not measured this one on a bench. We publish no decibel figures. What we will say is that the geometry is real acoustics, not a marketing shape.
| Fits | Antminer S9 family and any single 120 mm fan |
|---|---|
| Intake | 1 × 120 mm fan |
| Outlet | 6″ duct collar |
| Footprint | 210 × 210 × 218 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-120-6 |
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.
We do not know, and we are not going to guess. This design has not been measured on an acoustic bench. What the physics of an expansion chamber this size predicts is a modest single-digit transmission loss — useful, not transformative. Anyone quoting you a big number for a printed plastic chamber is selling, not measuring.
Different mechanism. Foam absorbs high frequencies and does very little for the low-frequency rumble that actually travels through a house. A reactive chamber targets a band by geometry. Neither is magic. The practical advantage here is that there is nothing to compress, degrade or shed fibres into your airflow.
Some. Any chamber in the path costs pressure, and this one is not exempt. On a short duct run with a healthy fan it is unlikely to matter; on a long, restricted run it might. If airflow is your binding constraint, take the plain shroud and solve the noise somewhere else.
A silencer on the exhaust does nothing about intake noise, and on many machines the intake is the louder end. Ducting or baffling the intake side is a separate job — a filter ring helps with dust but not noise.
| Weight | 330 g |
|---|---|
| Dimensions | 21 × 21 × 21.8 cm |
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Last reviewed July 31, 2026.
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