$16.99 CAD
A 120 mm intake filter ring that holds a pad of filter media flat across the fan face, so dust collects on a frame you lift off in seconds instead of inside the heatsink fins. Media not supplied. PETG, made to order in Montreal, Quebec.
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This 120 mm intake filter ring holds a pad of filter media over the intake fan of an ASIC miner, so the dust in your garage, basement or workshop stops on the outside of the machine instead of settling into the heatsink fins. It is a frame, not a cartridge: you cut the media, you pull it out, you shake it off, you put it back.
Dust is the failure mode nobody watches for, because it never announces itself. A film of it on the fins is an insulating blanket, chips run hotter for the same fan speed, the machine quietly starts throttling and nothing on the dashboard says why. By the time it is obvious, cleaning means opening the case and blowing the boards out.
A ring on the front turns that job inside out. The dirt collects where you can see it and reach it in ten seconds, and the inside of the machine stays as clean as the day you racked it.
Any standard 120 mm fan face — the 120 mm frame with the usual 105 mm screw spacing that Antminer S9-class, S17-class and S19-class machines, single-fan enclosures and generic 120 mm case fans all share. It mounts on the intake side of the machine.
The ring is 140 × 132 × 23.6 mm, and it takes flat filter media cut to the aperture: furnace filter sheet, coarse open-cell foam, whatever your air actually calls for. Media is not supplied, and nothing about the consumable is proprietary.
For a 140 mm fan face, use the 140 mm Intake Filter Ring. For the twin-fan intake panel on an Antminer S19 or a standard S21, two of these rings will not sit side by side — that job belongs to the Antminer S19 / S21 Dual 120 mm Intake Filter Ring, which spans both fans on one frame.
Every gram of dust that reaches a hashboard has to be removed later with the machine apart. Filtering the intake moves that maintenance to the outside of the case and puts it on a schedule you control, instead of leaving it to accumulate somewhere you cannot see. The frame holds the media flat and evenly across the fan aperture, which is the part a taped-on square of furnace filter never manages — a sagging pad gets pulled into the blades and a bunched one leaves a bypass gap around the edge.
It is a single continuous PETG body. A filter frame has one mechanical job beyond staying put: hold the media flat and evenly tensioned across the aperture while the fan pulls on it, week after week, on a front panel that is not the cool spot people assume once the machine is racked next to its neighbours. PETG holds its shape there where PLA does not.
| Fits | Any standard 120 mm fan face, 105 mm screw spacing, intake side |
|---|---|
| Intake | 120 mm fan face |
| Outlet | Filtered intake — filter media not supplied |
| Footprint | 140 × 132 × 23.6 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 | 120 mm filter ring bundle (ZIP) — STL, CC BY-SA 4.0 licence, installation and safety guide |
| SKU | DC-ACC-FILT-120 |
A filter frame is exactly the sort of part that should not be anyone’s trade secret. D-Central Technologies designed this one, drew the rim and the media retaining edge, and open-sourced the whole thing under CC BY-SA 4.0 at the 3D models download center — our drawing, not a remix — with its own card at the 120 mm intake filter ring entry. Free to print, free to change, free to sell. If you own a printer and an afternoon, you should not have to buy this from anybody.
The download is the 120 mm filter ring bundle, and it carries the STL, the CC BY-SA 4.0 licence and the installation and safety guide.
If you would rather have it turn up ready to bolt on, that is what this listing is: made to order in PETG — black or orange — and shipped from Montreal, Quebec. Nothing about the file changes when you buy: the STL stays free, and the purchase, or a direct contribution at D-Central’s fund page, is what pays for the next frame size on the board.
Filter the intake, duct the exhaust: the full chain is in the D-Central shroud and ducting system.
No. The ring is the frame; you supply the media and cut it to the aperture. That is deliberate — the right media for a woodshop is not the right media for a finished basement, and tying you to one proprietary pad would make the part worse and more expensive.
Standard furnace filter sheet is the usual choice and cuts with scissors. Coarse open-cell foam is the other common one, and it washes rather than being thrown away. Coarse media restricts less and catches less; fine media catches more and loads faster. In a dirty room, coarse and changed often beats fine and forgotten.
Intake, always. Filtering an exhaust catches nothing worth catching and adds resistance to the hot side of the machine. If your goal on the exhaust end is to move the heat somewhere useful, that is a shroud and a duct, not a filter.
It is built to the standard 120 mm frame with 105 mm screw spacing, which is what nearly every 120 mm fan and 120 mm chassis position uses — from an Antminer S9 to a plain case fan. Machines with 140 mm fans need the 140 mm Intake Filter Ring.
For two separate 120 mm fan positions with room between them, yes — one ring per fan. For the paired 120 mm intake panel on an Antminer S19 or standard S21, the fans sit too close for two round rings to fit side by side, and the Antminer S19 / S21 Dual 120 mm Intake Filter Ring covers both on one frame with one pad.
| Weight | 62 g |
|---|---|
| Dimensions | 13.2 × 14 × 2.36 cm |
| Colour | Black, Orange |
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Last reviewed August 19, 2026.
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