$43.99 CAD
120 mm fan silencer shroud into 6-inch duct: a reactive expansion chamber between the fan and the collar turns part of the fan’s sound energy back toward the machine. No foam lining to shed. Made to order in PETG, shipped from Montreal, Quebec.
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This 120 mm fan silencer shroud does two jobs in one body: it takes a single 120 mm exhaust fan into a 6-inch duct, and on the way through it runs the air across a reactive expansion chamber. A plain shroud is a funnel that gets heat out of the room. This one is drawn with a deliberate step in cross-section between the fan face and the collar, and a step in cross-section is what turns part of the fan’s sound energy back toward the machine instead of letting it ride the air column into the rest of the house.
It is the part for a single-fan machine that lives where people are: an S9 heating a basement, a heat-reuse build in a workshop, a bench machine in the corner of an office.
The intake is the standard 120 × 120 mm fan face, which covers the Antminer S9 family and effectively any single-fan build turning a 120 mm fan. The outlet is a true 6-inch collar, so it drops into an existing 6-inch run wherever a plain shroud sits today: same flex duct, same worm clamp, same window port.
Two things to know before you choose it over the plain shroud. A silencer is a physically larger body — 218.2 × 210 × 210 mm — so it wants real space behind the machine, and a chamber draws on the same pressure budget your duct run spends. If the machine already runs warm, or the duct is a long route with several bends, buy the Universal Single 120 mm Fan to 6" Duct Shroud and win the noise back with placement. If your miner has two fans, the dual 120 mm silencer is the right shape.
Nothing electrical is touched. The stock fan stays and keeps its own speed control, and the shroud comes back off in under a minute.
Reactive silencing works on geometry, not absorption. Sound moving down a duct behaves like a wave in a pipe: meet a sudden change in cross-sectional area and part of it reflects back the way it came. Open the passage out sharply, hold that volume, neck it into the collar, and you have a reactive expansion chamber — the same element used in any exhaust that has to run near people. Nothing is consumed and nothing needs servicing. The shape is the mechanism.
The usual alternative is a lined box packed with acoustic foam. Foam works, and it also compresses, embrittles in hot air and eventually sheds into the airstream crossing your hashboards. This body carries no lining at all: one continuous PETG shell, no fasteners, no glued seams. PETG is the deliberate call, because it holds shape in ASIC exhaust heat where PLA softens.
| Fits | Any standard 120 × 120 mm fan flange on the 105 mm screw square, an Antminer S9 exhaust fan included |
|---|---|
| Intake | 1 × 120 mm fan |
| Outlet | 6″ duct collar |
| Footprint | 218.2 × 210 × 210 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, use, modify and redistribute |
| Download | silencer_120_to_6in.zip — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | DC-SIL-120-6 |
D-Central draws these parts in-house and gives the drawings away. This silencer’s geometry is released open source under CC BY-SA 4.0 through our 3D models download center: free to download, modify, remix, print in your own shop and sell what you make from it. No licence fee, no file held back behind a purchase.
D-Central Technologies designed this silencer, drew the 210 mm chamber and the 6-inch collar, and open-sourced the geometry. It is our part. Its card is at the 120 mm silencer entry, and the file is silencer_120_to_6in.zip — STL, CC BY-SA 4.0 licence, installation and safety guide.
This listing is the finished part: made to order in PETG, black or orange, shipped from Montreal, Quebec. The file never costs anything; buying the printed part or backing D-Central’s fund page is what pays for the next design in the line.
The full D-Central shroud and ducting system carries the compatibility matrix and the sizing guide for every collar we make.
Any 120 mm fan. The intake is drawn to the standard 120 × 120 mm fan face and its screw pattern, so it seats on an S9, an S9i, an older single-fan chassis or a custom build running a 120 mm case fan. What needs checking is space, not pattern: the body stands off the back of the machine further than a plain shroud does.
Yes. The collar is a standard 6-inch outside diameter, the size insulated flex, aluminium hose and 6-inch inline fans are all built around. A worm clamp is all it takes. If your run uses rigid pipe, the 6-inch flex duct adapter makes that transition properly instead of taping two mismatched sizes together.
No. Two chambers on one machine eat twice the space and give the flow two throats to argue over. Use the dual 120 mm expansion-chamber silencer, which merges both fan columns into one plenum ahead of the step in cross-section. One merged path is the better acoustic body and the simpler duct run.
A chamber is one more element in the exhaust path, and every element spends part of the same pressure budget. A short straight 6-inch run with a healthy fan has margin for it. A long run full of elbows, or a machine already warm, is better served by the plain 6-inch shroud with the noise moved by distance.
Each shroud is printed for your order and shipped from Montreal, Quebec. That is how a build-to-order shop keeps 80-plus shroud and ducting variants alive at one tolerance standard instead of warehousing a guess at demand.
| Weight | 571 g |
|---|---|
| Dimensions | 21 × 21 × 21.82 cm |
| Colour | Black, Orange |
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Last reviewed August 19, 2026.
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