Antminer S19 / S21 Dual 120 mm to 150 mm Metric Duct Shroud

Description

150 mm duct shroud for Antminer S19 and S21 dual 120 mm exhaust

A 150 mm duct shroud exists because 6 inches is 152.4 mm. If you live anywhere that sells ventilation in millimetres, that gap is the reason your ASIC ducting looks the way it does: a 150 mm hose stretched over an imperial collar, foil tape doing the sealing, and a joint you re-tape every few months. This shroud takes the dual 120 mm exhaust of an Antminer S19-class or standard S21-class machine and lands it on a collar drawn in metric from the start.

150 mm is the workhorse domestic extraction size across Europe and much of the metric world: what the extract fans use, what the cheap hose comes in, and what every builders merchant stocks. Both fan columns are gathered inside a single-piece PETG body and converge into one 150 mm outlet.

What it fits: any dual 120 mm exhaust on a 120.0 mm pitch

Fitment is decided by the fan face, not the model badge: 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. In practice that is the Antminer S19 series, including the S19j Pro and S19 XP, and the standard S21.

It is not for 140 mm machines. If your miner has two 140 mm fans, the S21 Pro and S21+ generation among them, use the dual 140 mm to 150 mm metric duct shroud instead. If your ducting is 160 mm rather than 150 mm, that is the 160 mm version, and if it is imperial 6-inch, the 6-inch version.

How it installs

1. Sit the flange over both exhaust fans and line it up on the stock fan screw pattern.
2. Drive the screws through the 5.0 mm holes and 5.424 mm slots. Reuse the miner’s own large-head fan screws, or add a 9 mm or larger flat washer under each head.
3. Slide 150 mm metric flex duct over the collar and past the 150.0 mm crest.
4. Clamp on the 148.0 mm sealing land behind the crest.
5. Route the duct out: window port, plenum, inline fan, or the room you are heating.

Why a metric-native collar changes the joint

Duct joints fail in one of two ways. Either the collar is too big and the hose is stretched until the spiral wire deforms, or it is too small and tape becomes the structure holding the run together. A collar cut for the hose you own avoids both: crest at duct nominal, sealing land 2.0 mm below it, at or under the male metric hardware the duct is built to slide onto. The hose goes over the crest, a clamp closes onto the land, and the crest is the mechanical stop.

• Lands on real 150 mm metric duct, the standard domestic extraction size in metric markets.
• Clamps rather than tapes: 150.0 mm crest, 148.0 mm land, plain worm clamp.
• Bolts to the stock fan screw pattern with no drilling and no electrical change.
• Merges both 120 mm columns before the transition so the duct sees one organised stream.
• Leaves 9.38 mm of driver clearance around the tightest fan screw.
• Comes out as one piece of PETG, which holds its shape in ASIC exhaust heat.

Specifications

Open source: the file is free, wherever you are

Metric buyers are usually the ones paying international shipping on a part that weighs almost nothing. So D-Central Technologies gives the design away: we drew this shroud, we cut the 150.0 mm crest and the 148.0 mm sealing land, and we open-sourced the result under CC BY-SA 4.0 at the 3D models download center. Its own card is at the dual 120 mm to 150 mm entry, free to download, modify, print and sell, and the direct download is the 150 mm metric shroud bundle: STL, CC BY-SA 4.0 licence, and the installation and safety guide. If there is a printer within reach, that is the fastest route to a 150 mm collar. If not, this listing is the finished part, made to order in black or orange PETG in Montreal, Quebec and shipped worldwide — the collar geometry stays free either way, and a sale here or a gift at the D-Central fund page is what pays for the next metric size on the board.

Works with

• Antminer S19 / S21 Dual 120 mm to 160 mm Metric Duct Shroud
• Antminer S19 / S21 Dual 120 mm to 200 mm Metric Duct Shroud
• Antminer S19 / S21 Dual 120 mm to 6″ Duct Shroud
• Dual 140 mm Fan to 150 mm Metric Duct Shroud
• Antminer S19 / S21 Dual 120 mm Intake Filter Ring

The full range is in the D-Central shroud and ducting system.

Frequently asked questions